If it was a flat Earth, to get a round shadow, that can only happen at midnight. The shape of the Earth’s shadow on the Moon is always round this happens no matter what time the lunar eclipse is occurring. A lunar eclipse is when you have the Sun and the Earth and the Moon all in a straight line, and the Moon passes into the Earth’s shadow. Well maybe while you’re looking for the green flash, if you’re sitting on a beach and you watch a ship disappearing over the horizon it doesn’t just fade into nothingness it will actually dip below the horizon and look like it’s sinking down and that’s because the Earth curves away.Īnother one, which is probably my favourite one, is to think about lunar eclipses. One of them, if you go to a beach - we were talking about looking for the green flash before. There are a number of ways to do it I guess two of the most simple ones. You can do with just observations and common sense really. We’ve known that the Earth is spherical for thousands and thousands of years.
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