Two friends, two sticks, a sunny day and a cell phone. That's all you need to prove the Earth's shape and estimate within about 10 percent it's circumference.
I like my oblates to be in the oven, not spinning in a vacuum while also being a spheroid.
https://ericdubay.wordpress.com/2018/07/08/200-proofs-earth-is-not-a-spinning-ball-english/
Two friends, two sticks, a sunny day and a cell phone. That's all you need to prove the Earth's shape and estimate within about 10 percent it's circumference.
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