Carl Sagan on Epicycles, Ptolemy, and Kepler
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great video thanks
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brilliant video
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you have some great stuff here
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some really good stuff here
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@Npowell01 Aristarchus possibly modeled a heliocentric solar system in the BC's. Carl touches on your last part somewhere in the series/book, on the possible thoughts of the early humans.
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Ancient Hindus conceived of a heliocentric solar system long before Copernicus, and I imagine there was the occasional person through the ages who conceived of it without actually knowing how to write it down.
The thoughts of so many of history's geniuses are lost on us. Imagine the 180,000-or-so years of anatomically-modern humans who COULDN'T write. So much went unrecorded.
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And the fact that he propelled himself into the darkness of assumption-free inquiry in an environment which showed no end of hostility to assumption-free inquiry is quite astonishing.
I can't say I'm sure I'd have the same bravery if I had been in his shoes. I can hope, but I can't assume it to be so. And that's the insight a healthy balance of skepticism/curiosity yields.
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@T0B0KKE It was actually Copernicus who proposed the heliocentric model which explained the retrograde motion of the planets.
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@LeFraz Tycho Brahe discovered why planets apparent movement among the starts went backwards at some point... I am certain of this. You can go check wikipedia.
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Carl Sagan had more intelligence in his toe nails than you do in your whole body.
phantomspellchecker 2 years ago 27
Kepler was an amazing man, but there were plenty of pre-christian, and non-western people that have used science and natural laws before Kepler.
But Kepler was unique because he was born into a time in which he had no reason to believe in natural laws except for his own curiousity.
gydorack 3 years ago 12