How do we know the Earth is round and what makes it possible?
In: Physics
If you observe objects in the horizon you observe phenomena that is only possible if the Earth is round. With a little bit of trigenometry it is also possible to calculate the size of the Earth to very high precision. This is even written in some of the earliest records we have and have never been disputed until recently. The reason why the Earth is round is that gravity pulls everything to each other. So if there is a feature that makes the Earth less then round such as a mountain gravity will be able to pull the matter downhill to the side making it smoothe again.
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