But since we already know this, let's do it the other way around and deduce the distance to which we can see the full boat: In fact, if you would know the size of the boat and its distance, we could infer the radius of the Earth. The part of the boat that is missing in the left image is hidden by the quasi-spherical shape of the Earth. My pictures, taken with a 30x optical zoom camera. I took two pictures of a distant boat, within an interval of a few seconds: one from the lowest deck of the ship (left image), the other one from our highest observation platform (about 16 m higher picture on the right):Ī distant boat seen from 6 m (left) and from 22 m (right) above the sea surface. Last summer I was on a scientific cruise in the Mediterranean. You can realise the curvature of the Earth by just going to the beach.
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