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The most influential book I have ever had on astronomy in general, which I have honestly wanted to add to (it has 8 planets, pluto, and asteroids, as well as the sun and the moon. I want to add dwarf planets and a section on the big 3-4 asteroids. 😄) Is Roy A. Gallant's National Geographic Picture Atlas to Our Universe.


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Wasn't it pretty obvious to a careful astrologer a thousand years ago, that the Moon does not have a circular orbit and does not describe epi-cycles? The ancient Greek model of the motion of planetary bodies remained unchallenged for almost two millennia, so obviously not. Hipparchus' model did a fairly good job dealing with the elliptical motion of ...



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