I know the earth is a sphere, I’m definitely not debating that, but I also know there are various tests you can do on a relatively small scale to prove that the earth is not flat,. Are there similar tests that prove specifically that it is a sphere?
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The simplest test is a lunar eclipse. The earth itself causes the shadow on the moon. The shadow is round. Ergo, the earth is at least round-ish. This is only a 2d slice view of the earth, but as the earth spins in place and we watch several eclipses at different times of night, we can see it’s mostly round. This won’t give you full coverage of the whole earth since you can’t observe a lunar eclipse at noon so some parts of the earth remain un-observed, but it should be pretty convincing. Certainly it should rule out a Torus shape.
There are other tests for the earth’s round-ness, but you’ll have to leave your backyard for them.
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