Question

Which is the main proof for the curvature of Earth?
(A) The disappearance of a ship slowly from the bottom to top and its appearance from top to bottom when it goes away from and comes to an observer
(B) Evidence of circum-navigation of earth
(C) Evidence of day and light
(D) Transcontinental air flights

Answer 1

Hint
One can correctly notice the curvature of the Earth while being in the sky. This could also be achieved in observing sailing off of a ship to the sea.

Complete step by step Answer
The curvature of the earth is possible to be from the sky but one can see a demonstration regarding the same. if you visit a dock or a place having a widespread view of the water. While observing a ship after sailing off to sea and its flagpole as the sailing ship is at a far distance, one can observe the flagpole of the ship appearing to be sinking which is not the case. This means it does not appear to be fading off into the distance. One can observe this using a pair of binoculars to see the ship that is farther off into the distance which will after some point appear to be sinking.
Another phenomenon that could be proof of the curvature of the earth is the evidence of day and light. If the surface of the earth would be flat, all the places on the earth would receive the same amount of light from the sun every day but this is not the case. The length of a day varies based on the position of the places closer to or farther from the earth’s poles. Places that lie closer to the poles observe long days in the summer and short days in the winter.
Therefore, (A) and (C) are the correct answer.

Note
This is the reason the Earth is spherical to balance the atmosphere, weather, and all their phenomena related to us.