You can prove round earth while in the lake right on the horizon. For example, on the Lake.

When you're there, the skyscrapers in the City of Chicago just look the upper part only.

This proves that the earth is not flat. if it is flat, surely you can see all parts of the building.

The height of the Sun.



As you move away from the equator, the sun will appear to move lower in the sky. It proves that there is a curvature on earth that resembles a sphere shape.

Lunar eclipse


the shadow of the earth will look curved when there is a lunar eclipse. This proves that the earth is round like a ball.

The whole planet is round



The number of planets in the universe is innumerable. However, from what appears, everything is round.

logically, if another planet is round, the earth is definitely round, because it belongs to the type of planet in the solar system.