Happy Saturday, everybody. In this week's episodes on Antie jump Canon, we talked about her making several trips to observe total solar eclipses, and back in when we were each making plans to observe an upcoming solar eclipse, we recorded an episode on some solar eclipses in history. So when we recorded that episode back in we of course had not actually seen the eclipse yet. The episode came out on eclipse Day and it was recorded beforehand. But now we have, and having seen a total solar eclipse, which I did from a vantage point in Missouri, I found Annie jump Canon's writing about her experiences truly moving and lovely, and I felt like I kind of bonded with her over our eclipse viewing experiences. So I wanted to pull that eclipse episode out for our classic today. We hope you enjoy Welcome to Stuff You Missed in History Class, a production of I Heart Radio. Hello, and welcome to the podcast. I'm Holly Fry, I'm Tracy V. Wilson, Jersey. Do you know what everyone on Earth is talking about? It is We've reached It's all eclipses all the time. We reached the point that my mom and her sisters are talking about eclipses on our family Yahoo group, which is a threshold in how many people are talking about something right. Uh. And that is, of course because of the event that is being built, at least in the US, is the Great American Eclipse, which will have happened on the same day that this episode publishes August. Uh. I suspect this episode will air after the eclipse actually happened, or right around it in terms of when it goes live. But um, Moreover, if people are into the eclipse, they're probably out watching the eclipse and not sitting somewhere listening to a podcas. I'm gonna tell you that's where I will be. Is there I'm traveling to because we you are near the line of tortality. I am not. So we're going on a trip. Yeah, we have a little officey thing planned. Um. But so for that end, we are not going to fill this with warnings about how to carefully observing eclipse. I hope you will have gotten those before you may be looked up. Um. But it seems like a great time to discuss some eclipses in history. There are a lot of eclipses that have been recorded through the ages, but today we're going to talk about five of them. Uh, if we leave your favorite out, our apologies, but we just wanted kind of a sampling of eclipses and kind of their interesting points in the historical record. Yeah, And to be clear, today we are talking specifically about solar eclipses when the Moon passes between the Earth and the Sun and at least a portion of the Sun is blocked, casting a shadow on the Earth. We are not getting into lunar eclipses, when the Earth passes between the Sun and the moon, which causes the Moon to go dark. Right. And there are four types of solar eclipse, partial, annular, total, and hybrid. And a partial eclipse occurs when the Moon only obstructs a part of the Sun, and this is often described as the Sun looking as though there is a bite taken out of it. Annular means ring shaped. I don't know about you, Holly, but the eclipses that I have seen so far, aside from partial ones, have all been annular eclipses um, which comes from the Latin word annulus, so an annual. An annular eclipse is when the Moon passes in front of the center of the Sun. But it leaves a ring of the Sun visible around the moon, and a total eclipse, as when the Moon is close enough to the Earth that as it passes in front of the Sun, the Sun is completely blacked out, so there's not a sliver or a ring around the outside as in the case of the annular eclipse. The Sun's corona is still visible. Though there is this much talked about eclipse that's happening that the day this episode airs, which is August, that is a total eclipse. Yeah, sometimes I have found in it when I was younger. It took me a long time to really grasp This sounds so foolish as I say it, but the difference between an annular eclipse and a total eclipse, because you still see that coronal ring on a total eclipse. And I'm like, but you can still see it, And they're like, no, you're not seeing the sun. You're seeing the light off of the sun, right, And I'm like, but I'm seeing sunlight and so, but it's that's the thing. You still see light. And as we were planning our whole our trip, we were talking to the other folks who are going to be traveling with us, Um and I had, I was like, okay, but I remember watching an eclipse at my elementary school and I had to go look that up and like figure out what year was that, what was going on? It was an annular eclipse. And then I said, okay, now I also remember watching one in our yard. Look that one up, also an annular eclipse. And then I was like, Okay, Obviously my memory is not as sharp as I would like it to be regarding what eclipses I have seen. Oh, mine definitely is not um. And the fourth type that we mentioned, a hybrid eclipse, is one that appears to be a total eclipse from one vantage point on Earth and an annular eclipse from another point on Earth at the same time. And that has to do with where the Moon is in position in relation to your position on Earth in the position of the Sun. So additionally, annular, total and hybrid eclipses will look like partial eclipses from positions that are outside of the path of totality. So where you are in Atlanta is near the path of totality. So we mostly covered up. Yeah, Also we're kind of excited about this whole eclipse situation. If you cannot tell the oldest known story of a solar eclipse also comes with a sad tale of two men who failed to predict it. Uh. This particular event took place in China around seven b C. There are actually some discrepancies as to whether or not that you're is accurate. Writings in China from this period have described such events really quite poetically, as quote, the Sun and Moon did not meet harmoniously. So to be clear, there were eclipses before this point, but we are just talking about ones that were recorded. It was not the first that I happened, must have been, but yeah, so Ancient China's mythology around eclipses was that they took place when a celestial dragon was eating the sun, and in a tradition that built around the idea of scaring the dragon a way to get the sun back, people would make lots of noise by blinking, banging pots together, playing drums, and basically doing anything that would create the loudest sound possible, which sounds pretty fun. Uh. The apocryphal story attached to this ancient eclipse involves to court astronomers Ho and He. Their job was to predict any important celestial events and inform the emperor of them. And as the story goes, in this case, the emperor only learned of the eclipse event when he heard the banging noises of his people trying to frighten the mythical dragon. Naturally, this failing on the part of the astronomers, who according to legend, were drunk when they should have been doing their jobs, was met with a great deal of anger on the part of the emperor, and the story goes that they were then executed for their poor job performance. There's even a pretty unkind poem that's often cited when this story is discussed, and the poem goes, here lie the bodies of Ho and He, whose fate, though sad, was visible, being hanged because they could not spy the clips which was invisible. Hi Ho Tis said, a love of drink occasioned all the trouble. But this is hardly true, I think for drunken folks c double. This text is unattributed. We don't know who wrote it, and it was likely almost certainly written long after the event in China by a Western author, just based on these sort of apocryphal stories of Ho and He, and this has led to this blanket assumption that these two men were incompetent, but there have been other discussions of them in the historical record and China's astronomical knowledge that was done in a few different works throughout the centuries. So, according to Chinese animals analyzed by later astronomers, he and Ho had actually done a great deal of work on reforming the Chinese calendar through their observations and their calculations, and they had made it a lot more accurate. Eighteenth century Englishman John Jackson, after doing his own research and analysis and pulling from translations of Chinese animals as well as contemporary astronomy authors, found that accounts suggested that this eclipse, if it's the one that astronomers were pointing to, was very brief, and he wrote in seventeen fifty two quote, if the eclipse was really so small and so short, it is not to be wondered that the two astronomers he and Ho, should not have observed it, nor could any others hardly be supposed to have seen it. But part of the problem is that all of this is backwards engineering an event that could have been just one of any number of possible eclipses that were referenced within ancient Chinese writings. The Jackson quote that we just mentioned is an analysis of one of those events, which may or may not have been the one that sealed the astronomer's spates. So again, that is if this whole execution story is actually true. The Proceedings and Transactions of the Scientific Association includes the full text of an address that was given by the Reverend J. T. Petty about this story, and he makes the case that if you take this story at its word, it really serves as a testament to how advanced China's astronomical knowledge was at the time. As part of his case, he says, quote, China must have been pretty well stocked with astronomers, or she could not have afforded to sacrifice two of them. Had they been the only astronomers in the empire, their lives would have been spared for future service, whatever their dereliction of duty. Yeah, so those poor drunken astronomers maybe just got a bad room. Uh. And next up, we're going to talk about Homer's Odyssey, But before we get into that, we're gonna pause and have a little sponsored break. The Odyssey was written by Homer around eight hundred b C. But it tells the story set around twelve d BC, centuries before this poem was actually conceived, and in telling the tale of Odysseus in his decade long voyage, Homer might have recounted an eclipse that took place in eleven seventy eight b c E. The Acclimatists, a seer character within the narrative, shares a prophecy about the doomed fate of penelope suitors, and ends with what some people believe is a description of an eclipse quote. The sun has been obliterated from the sky and an unlock an unlucky darkness invades the world. In the story that's still very much alive. Odysseus kills all of the suitors during this event. In the early part of the twentieth century, astronomers Carl Shock and Paul Nugebauer determined that the Ionian Islands would have seen a total solar eclipse on April sixteenth of eleven seventy eight b c E, and this place did about one decade after the city of Troy was destroyed. But this idea was largely dismissed by critics, who felt that there was no way that Homer could have had knowledge of such an event and written about it when it had happened several hundred years before his time. But this topic was revived in two thousand seven when two biophysicists, Constantino by Cuzas and Marcello oh Magnasco, used software to analyze data they collected from this text. They combed through the Odyssey and noted mentions of constellations and the positions of Venus and Mercury, and the new moon which happened the night before the prophecy, And using all of that collected data, they determined the possible dates that could have matched the dis oyptions in the epic poem, and their match was drumroll please, April sev. But even in their paper, which was published in two thousand eight by Cusus and Magnasco, are very clear that it would be amazing and not terribly likely if Homer knew about this event, they wrote, quote The main implausibility in the conclusions is that they imply that the author of the lines in question was first interested in advanced astronomy at a time when there were no traces left that the Greek had an interest in it beyond clindrical purposes. And in possession of detailed astronomical data of events happening perhaps five centuries before him. This paper goes on to discuss the indications that Homer was interested into in astronomy and then examines various improbable but not impossible means by which the knowledge of a historical eclipse could have made its way into his sphere of knowledge. But they acknowledge that it's really hard, a really hard case to prove, and they conclude with quote much research is needed before we can move beyond such speculations. We can only modestly hope to convince other scholars that the case against Chokes eclipse may have been too hastily closed, and just inspire them to ponder if the remarkable coincidence described in this paper may in fact not be coincidental at all. And to be clear, they have definitely had detractors like they have they have had people right response papers that are criticizing all of this. But it's an interesting idea to think about. The next eclipse that we're going to talk about happened in eighteen thirty six. So on May fifty six, there was an annular eclipse that crossed over the United Kingdom and its totality, and during this particular event, a characteristic of eclipses was identified and named for its observer, Francis Bailey. Francis Bailey was a British astronomer who had been born in seventeen seventy four, and initially he had gone into business and done quite well for himself, but at the age of fifty one, he retired from his work on the London Stock Exchange and writing books about annuities, to instead to vote his time to science. That charms me a lot, me too, But this really wasn't like an out of the blueshift for him. It's not like he said, Okay, business time over now I'm when I think about the night sky. He had actually been interested in science and astronomy for quite some time, and in eighteen twenty, which was five years before he left his finance work, he had been a driving force behind the formation of the Royal Astronomical Society, and in the founding of that society, which aimed to promote research in astronomy, he was among colleagues such as John Herschel and Charles Babbage for the eighteen thirty six eclipse. Bailey wanting to see it at his best advantage, traveled to Scotland and the weather on a day of the event was excellent. The sky was cloudless, and Bailey's experience was relayed in a December ninth, eighteen thirty six proceeding of the Royal Astronomical Society, as he had spoken about it at their meeting, and this is kind of long, but it's a relaying of what he saw, so bear with us on this lengthy quote. After a brief discourse on Bailey's position and set up to watch the eclipse, this account in the proceedings reads quote he says he was in expectation of meeting with something extraordinary at the formation of the annualis, but imagined it would only be momentary, and consequently that it would not interrupt the noting of the time of its occurrence. In this, however, he was deceived, as the following facts will show. For when the cusps of the sun were about forty degrees asunder, a row of lucid points, like a string of beads, irregular in size and distance from each other, suddenly formed around that part of the circumference of the Moon that was about to enter on the Sun's disk. This he intended to note as the correct time of the formation of the annualists, expecting every moment to see the ring of light completed round the Moon, and attributing this serrated appearance of the Moon's limb, as others had done before him, to the lunar mountains. Although the remaining portion of the Moon's circumference was perfectly smooth and circular as seen through the telescope, he was somewhat surprised, however, to find that these luminous points, as well as the dark intervening spaces, increased in magnitude, some of the contiguous ones appearing to run into one another like drops of water. Finally, as the Moon pursued her course, these dark intervening spaces were stretched out into long, black, thick parallel lines joining the limbs of the Sun and the Moon, when all at once they suddenly gave way and left the circumference of the Sun and the Moon in those points, as in all the rest, apparently smooth and circular, and the Moon perceptibly advanced on the face of the Sun. After the Moon had crossed over the center of the Sun, Bailey observed another surprise. According to his account quote, all at once, a number of long, black, thick, parallel lines exactly similar in appearance to the former ones mentioned suddenly darted forward and joined the two limbs as before, and the same phenomena were repeated, but in inverse order. So we witnessed the lines terminating in a curved line of bright beads, which vanished as the annualists ended. The formation of the beads wasn't witnessed by other astronomers as well, several of which Bailey consulted with. And Bailey was right. It's the lunar geography that causes these beads to form as the sun outlines the valleys and peaks on the Moon's surface. Uh Incidentally, when only one beat is visible, this is called a diamond ring effect because you kind of see the little corona of light and then one bright spot, so it kind of looks like a sparkly ring. And no other astronomers did observe this happening. The beat effect is named for Bailey, and while observing eclipses after the one in May of eighteen thirty six, astronomers continued to look for Bailey's beads as hallmarks of the eclipse process. Today, photos of eclipses are readily available in books and online, but that certainly was not always the case. So in a moment we are going to talk about the first photo of an eclipse, but first we will pause for a word from a sponsor. On July one, there was a total eclipse with the totality over Prussia, and this particular eclipse is noteworthy because in preparation for the event, the director of the Royal Observatory in Knigsberg hired a photographer to capture it. Johann Julius Friedrich Brokowski was a skilled de garatypist and he was the man the observatory reached out to. Brokowski used a small refracting telescope in conjunction with a heliometer, which is a telescope design for measuring the apparent diameter of the Sun and for measuring angles between celestial bodies or points on the lunar surface. It took an eight four second exposure once the eclipse is totality began, and what resulted was the first successful photo of a solar eclipse, which included the visual capture of prominences emanating on the Sun's surface. And this image is tiny. It's one of those things when you think about a photograph, and especially if you've seen it online or in books, you think of like photograph size, like a four by. This thing is little, little, It's way smaller than that. The moon on the original plate was only seven point eight five millimeters in diameter. And while the director of the observatory initially wrote about the groundbreaking photo without crediting Burkowski, eventually the photographer Slash Degirotypist made his own prints from his plate. These prints were slightly enlarged, but still quite small. As a point of reference, the moon's diameter and these prints was eight point six nine millimeters. One of these prints still exists and is in the collection of the Yenna University Observatory in Yenna, Germany. Another set of prints from Burkowski's plates was ordered by German astronomer Carl Friedrich Wilhelm Peters in and copies of the Peters prints would go on to be used in textbooks and other publications. Today, you can easily find Brokowski's iconic photograph online and there are even some images of a human hand holding a framed prince to illustrate how little this groundbreaking photograph is yeah. It with the frame included, We're talking like a couple inches that someone can just hold between their thumb and four finger is very small. The last eclipse that will talk about is one that's come to be known as Einstein's eclipse. It took place on May twenty nine, nineteen and several years prior to this eclipse, Einstein had published his now famous General Theory of Relativity UH for very broad strokes. The crux of the theory is that space can be curved by the influence of gravity of anybody with mass, and this was at odds with Newton's Principia, which we have talked about on the podcast before, and which established mathematical rules that applied to celestial motion and was more static and did not take into account something like a gravity bend. Sir Frank Watson, Dyson, Astronomer Royal of Britain, began to think about the possibility of testing the theory by observing light with gravity could distort space, then light passing through that space would also curve. But our Sun is so bright that we can't really see the way other stars light might be bent by the Sun's gravity, and this led him to realize that the darkness of the Sun as viewed from Earth during an eclipse would offer an opportunity to observe light bending as it approached the Sun's edge if Einstein's theory was correct. And side note, you might be wondering if photographs of previous eclipses in the decades since Burkowski's first Digara type would have offered any evidence. But this bend and light is seriously slight the photographs at that point we're not of good enough quality to detect such a change, which really can only be analyzed with really quite precise measurement. Once it was determined the eclipse would be the testing ground, another British astrophysicist, Arthur Stanley Eddington, led the test. In the first two months of nine nineteen. He measured the position of the stars that the Sun would be passing in front of during the predicted May eclipse. For the eclipse itself, he traveled to an island off of Africa's western coast, and at the same time he dispatched another team of astronomers to Brazil to take measurements, and this was for coverage in the event that the island had cloud cover on May the twenty nine, but as it turned out, both locations had a clear view of the eclipse, so there were two separate sets of measurements to use. The eclipse lasted for six minutes during its totality, and both teams took photos throughout that brief time. And after the eclipse ended, Eddington gathered all the information and went back to England and spent the next several months analyzing it. Eddington's findings, which are announced on November six, nineteen nineteen, vindicated Einstein improved his general theory of relativity was correct. While there were certainly detractors who suspected that Eddington had somehow falsified the data to support Einstein, this is literally the moment that made Einstein famous. On November seven, he was front page news and suddenly the German born as Assist was the global poster child for genius measurements taking during eclipses. After continued to back up Einstein's theory and Eddington's findings, Yeah, which is really cool. I did somehow I missed that growing up, that piece of information that it was really an eclipse that made Einstein famous. In my head because he's such a famous figure, I think in my head he just people are like, wow, this is an amazing theory. You're smart. I never think of him as being, you know, having detractors, but of course he did, and it's just my weird, uh take on it. But yeah. So those are a few stories of eclipses in history. As we said, there are many many more. I think the next eclipse doesn't happen until four so if we're still doing this podcast in seven years, we can do another, or just if we want to talk about eclipses at some point between now and then, we could do an eclipse survey episode and talk about a few more about looter eclipses. People don't get as excited about lunar eclipses, yeah, because they're like, it's already dark, so the darkening of the moon isn't quite as dramatic, even though it's very cool and you can sometimes get like a blood moon, which is amazing. Um yeah, yeah, but they're fascinating. I hope if everybody listening watched it, whether in person or online or some other way one, I hope anybody that actually watched it in person was very careful with their vision and with their camera. Don't and does your camera, point your camera at the sun. No, there are so many things you have to have to be careful with. Uh. So, I hope you enjoyed it, and if you, uh you know, missed it. The good news is we live in an information age where it's all going to be online instantly. Hooray. Yeah, thanks so much for joining us on this Saturday. Since this episode is out of the archive, if you heard an email address or a Facebook U r L or something similar over the course of the show, that could be obsolete now. Our current email address is History Podcast at I heart radio dot com. Our old health stuff works email address no longer works, and you can find us all over social media at missed in History. And you can subscribe to our show on Apple podcasts, Google podcasts, the I heart Radio app, and wherever else you listen to podcasts. Stuff you Missed in History Class is a production of I heart Radio. For more podcasts from I heart Radio, visit the iHeart Radio app, Apple podcasts, or wherever you listen to your favorite shows.

Happy Saturday, everybody. In this week's episodes on Antie jump Canon, we talked about her making several trips to observe total solar eclipses, and back in when we were each making plans to observe an upcoming solar eclipse, we recorded an episode on some solar eclipses in history. So when we recorded that episode back in we of course had not actually seen the eclipse yet. The episode came out on eclipse Day and it was recorded beforehand. But now we have, and having seen a total solar eclipse, which I did from a vantage point in Missouri, I found Annie jump Canon's writing about her experiences truly moving and lovely, and I felt like I kind of bonded with her over our eclipse viewing experiences. So I wanted to pull that eclipse episode out for our classic today. We hope you enjoy Welcome to Stuff You Missed in History Class, a production of I Heart Radio. Hello, and welcome to the podcast. I'm Holly Fry, I'm Tracy V. Wilson, Jersey. Do you know what everyone on Earth is talking about? It is We've reached It's all eclipses all the time. We reached the point that my mom and her sisters are talking about eclipses on our family Yahoo group, which is a threshold in how many people are talking about something right. Uh. And that is, of course because of the event that is being built, at least in the US, is the Great American Eclipse, which will have happened on the same day that this episode publishes August. Uh. I suspect this episode will air after the eclipse actually happened, or right around it in terms of when it goes live. But um, Moreover, if people are into the eclipse, they're probably out watching the eclipse and not sitting somewhere listening to a podcas. I'm gonna tell you that's where I will be. Is there I'm traveling to because we you are near the line of tortality. I am not. So we're going on a trip. Yeah, we have a little officey thing planned. Um. But so for that end, we are not going to fill this with warnings about how to carefully observing eclipse. I hope you will have gotten those before you may be looked up. Um. But it seems like a great time to discuss some eclipses in history. There are a lot of eclipses that have been recorded through the ages, but today we're going to talk about five of them. Uh, if we leave your favorite out, our apologies, but we just wanted kind of a sampling of eclipses and kind of their interesting points in the historical record. Yeah, And to be clear, today we are talking specifically about solar eclipses when the Moon passes between the Earth and the Sun and at least a portion of the Sun is blocked, casting a shadow on the Earth. We are not getting into lunar eclipses, when the Earth passes between the Sun and the moon, which causes the Moon to go dark. Right. And there are four types of solar eclipse, partial, annular, total, and hybrid. And a partial eclipse occurs when the Moon only obstructs a part of the Sun, and this is often described as the Sun looking as though there is a bite taken out of it. Annular means ring shaped. I don't know about you, Holly, but the eclipses that I have seen so far, aside from partial ones, have all been annular eclipses um, which comes from the Latin word annulus, so an annual. An annular eclipse is when the Moon passes in front of the center of the Sun. But it leaves a ring of the Sun visible around the moon, and a total eclipse, as when the Moon is close enough to the Earth that as it passes in front of the Sun, the Sun is completely blacked out, so there's not a sliver or a ring around the outside as in the case of the annular eclipse. The Sun's corona is still visible. Though there is this much talked about eclipse that's happening that the day this episode airs, which is August, that is a total eclipse. Yeah, sometimes I have found in it when I was younger. It took me a long time to really grasp This sounds so foolish as I say it, but the difference between an annular eclipse and a total eclipse, because you still see that coronal ring on a total eclipse. And I'm like, but you can still see it, And they're like, no, you're not seeing the sun. You're seeing the light off of the sun, right, And I'm like, but I'm seeing sunlight and so, but it's that's the thing. You still see light. And as we were planning our whole our trip, we were talking to the other folks who are going to be traveling with us, Um and I had, I was like, okay, but I remember watching an eclipse at my elementary school and I had to go look that up and like figure out what year was that, what was going on? It was an annular eclipse. And then I said, okay, now I also remember watching one in our yard. Look that one up, also an annular eclipse. And then I was like, Okay, Obviously my memory is not as sharp as I would like it to be regarding what eclipses I have seen. Oh, mine definitely is not um. And the fourth type that we mentioned, a hybrid eclipse, is one that appears to be a total eclipse from one vantage point on Earth and an annular eclipse from another point on Earth at the same time. And that has to do with where the Moon is in position in relation to your position on Earth in the position of the Sun. So additionally, annular, total and hybrid eclipses will look like partial eclipses from positions that are outside of the path of totality. So where you are in Atlanta is near the path of totality. So we mostly covered up. Yeah, Also we're kind of excited about this whole eclipse situation. If you cannot tell the oldest known story of a solar eclipse also comes with a sad tale of two men who failed to predict it. Uh. This particular event took place in China around seven b C. There are actually some discrepancies as to whether or not that you're is accurate. Writings in China from this period have described such events really quite poetically, as quote, the Sun and Moon did not meet harmoniously. So to be clear, there were eclipses before this point, but we are just talking about ones that were recorded. It was not the first that I happened, must have been, but yeah, so Ancient China's mythology around eclipses was that they took place when a celestial dragon was eating the sun, and in a tradition that built around the idea of scaring the dragon a way to get the sun back, people would make lots of noise by blinking, banging pots together, playing drums, and basically doing anything that would create the loudest sound possible, which sounds pretty fun. Uh. The apocryphal story attached to this ancient eclipse involves to court astronomers Ho and He. Their job was to predict any important celestial events and inform the emperor of them. And as the story goes, in this case, the emperor only learned of the eclipse event when he heard the banging noises of his people trying to frighten the mythical dragon. Naturally, this failing on the part of the astronomers, who according to legend, were drunk when they should have been doing their jobs, was met with a great deal of anger on the part of the emperor, and the story goes that they were then executed for their poor job performance. There's even a pretty unkind poem that's often cited when this story is discussed, and the poem goes, here lie the bodies of Ho and He, whose fate, though sad, was visible, being hanged because they could not spy the clips which was invisible. Hi Ho Tis said, a love of drink occasioned all the trouble. But this is hardly true, I think for drunken folks c double. This text is unattributed. We don't know who wrote it, and it was likely almost certainly written long after the event in China by a Western author, just based on these sort of apocryphal stories of Ho and He, and this has led to this blanket assumption that these two men were incompetent, but there have been other discussions of them in the historical record and China's astronomical knowledge that was done in a few different works throughout the centuries. So, according to Chinese animals analyzed by later astronomers, he and Ho had actually done a great deal of work on reforming the Chinese calendar through their observations and their calculations, and they had made it a lot more accurate. Eighteenth century Englishman John Jackson, after doing his own research and analysis and pulling from translations of Chinese animals as well as contemporary astronomy authors, found that accounts suggested that this eclipse, if it's the one that astronomers were pointing to, was very brief, and he wrote in seventeen fifty two quote, if the eclipse was really so small and so short, it is not to be wondered that the two astronomers he and Ho, should not have observed it, nor could any others hardly be supposed to have seen it. But part of the problem is that all of this is backwards engineering an event that could have been just one of any number of possible eclipses that were referenced within ancient Chinese writings. The Jackson quote that we just mentioned is an analysis of one of those events, which may or may not have been the one that sealed the astronomer's spates. So again, that is if this whole execution story is actually true. The Proceedings and Transactions of the Scientific Association includes the full text of an address that was given by the Reverend J. T. Petty about this story, and he makes the case that if you take this story at its word, it really serves as a testament to how advanced China's astronomical knowledge was at the time. As part of his case, he says, quote, China must have been pretty well stocked with astronomers, or she could not have afforded to sacrifice two of them. Had they been the only astronomers in the empire, their lives would have been spared for future service, whatever their dereliction of duty. Yeah, so those poor drunken astronomers maybe just got a bad room. Uh. And next up, we're going to talk about Homer's Odyssey, But before we get into that, we're gonna pause and have a little sponsored break. The Odyssey was written by Homer around eight hundred b C. But it tells the story set around twelve d BC, centuries before this poem was actually conceived, and in telling the tale of Odysseus in his decade long voyage, Homer might have recounted an eclipse that took place in eleven seventy eight b c E. The Acclimatists, a seer character within the narrative, shares a prophecy about the doomed fate of penelope suitors, and ends with what some people believe is a description of an eclipse quote. The sun has been obliterated from the sky and an unlock an unlucky darkness invades the world. In the story that's still very much alive. Odysseus kills all of the suitors during this event. In the early part of the twentieth century, astronomers Carl Shock and Paul Nugebauer determined that the Ionian Islands would have seen a total solar eclipse on April sixteenth of eleven seventy eight b c E, and this place did about one decade after the city of Troy was destroyed. But this idea was largely dismissed by critics, who felt that there was no way that Homer could have had knowledge of such an event and written about it when it had happened several hundred years before his time. But this topic was revived in two thousand seven when two biophysicists, Constantino by Cuzas and Marcello oh Magnasco, used software to analyze data they collected from this text. They combed through the Odyssey and noted mentions of constellations and the positions of Venus and Mercury, and the new moon which happened the night before the prophecy, And using all of that collected data, they determined the possible dates that could have matched the dis oyptions in the epic poem, and their match was drumroll please, April sev. But even in their paper, which was published in two thousand eight by Cusus and Magnasco, are very clear that it would be amazing and not terribly likely if Homer knew about this event, they wrote, quote The main implausibility in the conclusions is that they imply that the author of the lines in question was first interested in advanced astronomy at a time when there were no traces left that the Greek had an interest in it beyond clindrical purposes. And in possession of detailed astronomical data of events happening perhaps five centuries before him. This paper goes on to discuss the indications that Homer was interested into in astronomy and then examines various improbable but not impossible means by which the knowledge of a historical eclipse could have made its way into his sphere of knowledge. But they acknowledge that it's really hard, a really hard case to prove, and they conclude with quote much research is needed before we can move beyond such speculations. We can only modestly hope to convince other scholars that the case against Chokes eclipse may have been too hastily closed, and just inspire them to ponder if the remarkable coincidence described in this paper may in fact not be coincidental at all. And to be clear, they have definitely had detractors like they have they have had people right response papers that are criticizing all of this. But it's an interesting idea to think about. The next eclipse that we're going to talk about happened in eighteen thirty six. So on May fifty six, there was an annular eclipse that crossed over the United Kingdom and its totality, and during this particular event, a characteristic of eclipses was identified and named for its observer, Francis Bailey. Francis Bailey was a British astronomer who had been born in seventeen seventy four, and initially he had gone into business and done quite well for himself, but at the age of fifty one, he retired from his work on the London Stock Exchange and writing books about annuities, to instead to vote his time to science. That charms me a lot, me too, But this really wasn't like an out of the blueshift for him. It's not like he said, Okay, business time over now I'm when I think about the night sky. He had actually been interested in science and astronomy for quite some time, and in eighteen twenty, which was five years before he left his finance work, he had been a driving force behind the formation of the Royal Astronomical Society, and in the founding of that society, which aimed to promote research in astronomy, he was among colleagues such as John Herschel and Charles Babbage for the eighteen thirty six eclipse. Bailey wanting to see it at his best advantage, traveled to Scotland and the weather on a day of the event was excellent. The sky was cloudless, and Bailey's experience was relayed in a December ninth, eighteen thirty six proceeding of the Royal Astronomical Society, as he had spoken about it at their meeting, and this is kind of long, but it's a relaying of what he saw, so bear with us on this lengthy quote. After a brief discourse on Bailey's position and set up to watch the eclipse, this account in the proceedings reads quote he says he was in expectation of meeting with something extraordinary at the formation of the annualis, but imagined it would only be momentary, and consequently that it would not interrupt the noting of the time of its occurrence. In this, however, he was deceived, as the following facts will show. For when the cusps of the sun were about forty degrees asunder, a row of lucid points, like a string of beads, irregular in size and distance from each other, suddenly formed around that part of the circumference of the Moon that was about to enter on the Sun's disk. This he intended to note as the correct time of the formation of the annualists, expecting every moment to see the ring of light completed round the Moon, and attributing this serrated appearance of the Moon's limb, as others had done before him, to the lunar mountains. Although the remaining portion of the Moon's circumference was perfectly smooth and circular as seen through the telescope, he was somewhat surprised, however, to find that these luminous points, as well as the dark intervening spaces, increased in magnitude, some of the contiguous ones appearing to run into one another like drops of water. Finally, as the Moon pursued her course, these dark intervening spaces were stretched out into long, black, thick parallel lines joining the limbs of the Sun and the Moon, when all at once they suddenly gave way and left the circumference of the Sun and the Moon in those points, as in all the rest, apparently smooth and circular, and the Moon perceptibly advanced on the face of the Sun. After the Moon had crossed over the center of the Sun, Bailey observed another surprise. According to his account quote, all at once, a number of long, black, thick, parallel lines exactly similar in appearance to the former ones mentioned suddenly darted forward and joined the two limbs as before, and the same phenomena were repeated, but in inverse order. So we witnessed the lines terminating in a curved line of bright beads, which vanished as the annualists ended. The formation of the beads wasn't witnessed by other astronomers as well, several of which Bailey consulted with. And Bailey was right. It's the lunar geography that causes these beads to form as the sun outlines the valleys and peaks on the Moon's surface. Uh Incidentally, when only one beat is visible, this is called a diamond ring effect because you kind of see the little corona of light and then one bright spot, so it kind of looks like a sparkly ring. And no other astronomers did observe this happening. The beat effect is named for Bailey, and while observing eclipses after the one in May of eighteen thirty six, astronomers continued to look for Bailey's beads as hallmarks of the eclipse process. Today, photos of eclipses are readily available in books and online, but that certainly was not always the case. So in a moment we are going to talk about the first photo of an eclipse, but first we will pause for a word from a sponsor. On July one, there was a total eclipse with the totality over Prussia, and this particular eclipse is noteworthy because in preparation for the event, the director of the Royal Observatory in Knigsberg hired a photographer to capture it. Johann Julius Friedrich Brokowski was a skilled de garatypist and he was the man the observatory reached out to. Brokowski used a small refracting telescope in conjunction with a heliometer, which is a telescope design for measuring the apparent diameter of the Sun and for measuring angles between celestial bodies or points on the lunar surface. It took an eight four second exposure once the eclipse is totality began, and what resulted was the first successful photo of a solar eclipse, which included the visual capture of prominences emanating on the Sun's surface. And this image is tiny. It's one of those things when you think about a photograph, and especially if you've seen it online or in books, you think of like photograph size, like a four by. This thing is little, little, It's way smaller than that. The moon on the original plate was only seven point eight five millimeters in diameter. And while the director of the observatory initially wrote about the groundbreaking photo without crediting Burkowski, eventually the photographer Slash Degirotypist made his own prints from his plate. These prints were slightly enlarged, but still quite small. As a point of reference, the moon's diameter and these prints was eight point six nine millimeters. One of these prints still exists and is in the collection of the Yenna University Observatory in Yenna, Germany. Another set of prints from Burkowski's plates was ordered by German astronomer Carl Friedrich Wilhelm Peters in and copies of the Peters prints would go on to be used in textbooks and other publications. Today, you can easily find Brokowski's iconic photograph online and there are even some images of a human hand holding a framed prince to illustrate how little this groundbreaking photograph is yeah. It with the frame included, We're talking like a couple inches that someone can just hold between their thumb and four finger is very small. The last eclipse that will talk about is one that's come to be known as Einstein's eclipse. It took place on May twenty nine, nineteen and several years prior to this eclipse, Einstein had published his now famous General Theory of Relativity UH for very broad strokes. The crux of the theory is that space can be curved by the influence of gravity of anybody with mass, and this was at odds with Newton's Principia, which we have talked about on the podcast before, and which established mathematical rules that applied to celestial motion and was more static and did not take into account something like a gravity bend. Sir Frank Watson, Dyson, Astronomer Royal of Britain, began to think about the possibility of testing the theory by observing light with gravity could distort space, then light passing through that space would also curve. But our Sun is so bright that we can't really see the way other stars light might be bent by the Sun's gravity, and this led him to realize that the darkness of the Sun as viewed from Earth during an eclipse would offer an opportunity to observe light bending as it approached the Sun's edge if Einstein's theory was correct. And side note, you might be wondering if photographs of previous eclipses in the decades since Burkowski's first Digara type would have offered any evidence. But this bend and light is seriously slight the photographs at that point we're not of good enough quality to detect such a change, which really can only be analyzed with really quite precise measurement. Once it was determined the eclipse would be the testing ground, another British astrophysicist, Arthur Stanley Eddington, led the test. In the first two months of nine nineteen. He measured the position of the stars that the Sun would be passing in front of during the predicted May eclipse. For the eclipse itself, he traveled to an island off of Africa's western coast, and at the same time he dispatched another team of astronomers to Brazil to take measurements, and this was for coverage in the event that the island had cloud cover on May the twenty nine, but as it turned out, both locations had a clear view of the eclipse, so there were two separate sets of measurements to use. The eclipse lasted for six minutes during its totality, and both teams took photos throughout that brief time. And after the eclipse ended, Eddington gathered all the information and went back to England and spent the next several months analyzing it. Eddington's findings, which are announced on November six, nineteen nineteen, vindicated Einstein improved his general theory of relativity was correct. While there were certainly detractors who suspected that Eddington had somehow falsified the data to support Einstein, this is literally the moment that made Einstein famous. On November seven, he was front page news and suddenly the German born as Assist was the global poster child for genius measurements taking during eclipses. After continued to back up Einstein's theory and Eddington's findings, Yeah, which is really cool. I did somehow I missed that growing up, that piece of information that it was really an eclipse that made Einstein famous. In my head because he's such a famous figure, I think in my head he just people are like, wow, this is an amazing theory. You're smart. I never think of him as being, you know, having detractors, but of course he did, and it's just my weird, uh take on it. But yeah. So those are a few stories of eclipses in history. As we said, there are many many more. I think the next eclipse doesn't happen until four so if we're still doing this podcast in seven years, we can do another, or just if we want to talk about eclipses at some point between now and then, we could do an eclipse survey episode and talk about a few more about looter eclipses. People don't get as excited about lunar eclipses, yeah, because they're like, it's already dark, so the darkening of the moon isn't quite as dramatic, even though it's very cool and you can sometimes get like a blood moon, which is amazing. Um yeah, yeah, but they're fascinating. I hope if everybody listening watched it, whether in person or online or some other way one, I hope anybody that actually watched it in person was very careful with their vision and with their camera. Don't and does your camera, point your camera at the sun. No, there are so many things you have to have to be careful with. Uh. So, I hope you enjoyed it, and if you, uh you know, missed it. The good news is we live in an information age where it's all going to be online instantly. Hooray. Yeah, thanks so much for joining us on this Saturday. Since this episode is out of the archive, if you heard an email address or a Facebook U r L or something similar over the course of the show, that could be obsolete now. Our current email address is History Podcast at I heart radio dot com. Our old health stuff works email address no longer works, and you can find us all over social media at missed in History. And you can subscribe to our show on Apple podcasts, Google podcasts, the I heart Radio app, and wherever else you listen to podcasts. Stuff you Missed in History Class is a production of I heart Radio. For more podcasts from I heart Radio, visit the iHeart Radio app, Apple podcasts, or wherever you listen to your favorite shows.