How could astronomers in the ancient world determine that the winter solstice was occurring? According to whoever edited the Wikipedia article on the winter solstice, it's too hard for modern ...
How did the Earth get its name? The answer on Wikipedia is a bit short and unhelpful. I was not just referring to its English name - in the few languages I know it translates to basically the same ...
Who (and when) discovered first that the Moon does not have its own light?