proof that the earth is round

aerial photographs

photos that are taken in space by satellites and spacecrafts show how the earth is round. astronauts that operate spacecrafts also observe that the earth is round.

ship visibility

when a ship approaches land from the horizon, the smoke from the ship will appear first and then gradually more of the ship will become visible as it gets closer to land. the entire ship would have been visible from the horizon if the earth was flat.

lunar eclispe

when the earth goes over between the sun and the moon, the shadow of the earth is shown on the moon as a black circle

what is the earth shape called?

geoid

another proof of the earth being flat

it is possible to leave your current location and travel in one continues direction until you reach your original location.