why does the bottom part of a ship disappears first from the horizon
Answers
Answer:
The earth is round, so the ship, as it steams away, drops slowly down the side of the spherical shape. As a result, you lose sight of the part of the ship that is closest to the surface, in the same way that you can see the top of tall buildings from a distance as you drive towards a city.
You can visualize this with any round object, even a dinner plate. Put some small object (which I will refer to as a gizmo), small enough that it is not able to be seen over the round object, against the side of the round object, then look at it from a variety of positions, moving slowly away from the gizmo. You will lose sight of the part of the gizmo closest to the round object first. Once you lose sight of the gizmo, reverse direction and you will begin seeing the part of it furthest from the round object first, just as you see the top of the tall buildings first when you approach a city.
By the way, this is absolute proof that the world is round. It doesn't matter which direction that the ship sails. She can go up the coast, down the coast or straight away. It makes absolutely no difference - the ship will always go hull down, the term we use to describe the effect.
tl;dr Because the earth is round.
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