Would you like to be able to see the size and shape of our world with your own eyes? You can, during a lunar eclipse.The first scientists in history were able to figure out what causes lunar eclipses two millennia ago, with no modern technology, and without even a complete map of the world. They were also able to figure out the size and shape of our world for the first time in history, by paying attention to what they saw during lunar eclipses. You can do this, too. You do not need to take a