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A comment on 20 Reasons We Know the Earth Is Spherical. Parent comment

Re:20 Reasons We Know the Earth Is Spherical by psalminen on Thursday June 14, 2018 @11:54AM (#17312570)
> 11. Gravity: This requires that the law of gravity can be derived independently from the fact that the earth is spherical. That's not easy.

This can be done by observing the motions of other planets/moons/stars/galaxies.

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