angular distance
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What is a Solar Eclipse?
March 2024: This post has been updated and republished from Sept 2017. A solar eclipse is the most amazing astronomical sight you’ll ever see. Not only is it the only time you’ll ever be able to clearly see the “new…
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The Celestial Sphere
When you look up at the night sky on a clear, dark night, it seems as if the stars are glittering like bright thumbtacks on a great canvas above you. (You can get a similar effect — with less light…
