How do we know the Earth is round and what makes it possible?
In: Physics
Today? We don’t need sticks, shadows, and ships disappearing beyond the horizon. We actually have a bunch of satellites up there, circling around it. You are using a subset of them whenever you turn on the GPS feature in your phone. Another subset of them was involved in taking pictures and measurements thanks to which we don’t just know “it’s round”, we already have a pretty decent 3D model of its surface.
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