Can someone remind me how shadows in the ground prove the curvature and roundness of the Earth?

Question

I know shadows in the ground prove how the Earth is positioned close the Sun and how the light reflects off the moon and something to do with the curvature of space and/or roundness of Earth but can someone give me a quick overview? Something to do with the roundness of Earth creates shadows.

Also, for the stupid Flat Earthers, I know flat land or flat surfaces don’t experience as many shadows or very rarely, but yeah can someone explain?

Thanks for helping the random thought.

In: 1

Answer 1

One of the first pieces of evidence was observed by Pythagoras. He noticed that during a lunar eclipse, the shadow cast by the Earth on the Moon was _always_ round – no matter what part of the Earth was observing the eclipse or where the Moon was possiitoned in the sky. This could only reasonably happen if the Earth was a sphere.

There are other experiments you can do using shadows as well, observing how those shadows change in different places over the course of a day. [Wikihow](https://www.wikihow.com/Prove-the-Earth-Is-Round#:~:text=One%20way%20to%20prove%20the%20earth,because%20of%20your%20higher%20vantage%20point.&text=One%20way%20to%20prove,your%20higher%20vantage%20point.&text=to%20prove%20the%20earth,because%20of%20your%20higher) has a few great examples you can do yourself.