Answer:
1. The Moon
During lunar eclipses, the shadow on the Moon’s surface is round. This shadow is the planet’s, and it’s a great clue about the spherical shape of the Earth.
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2. Seeing farther from higher
The higher up you climb, the farther you will see. we tend to relate this to Earthly obstacles, like the fact we have houses or other trees obstructing our vision on the ground, and climbing upwards we have a clear view, but that’s not the true reason. Even if you stood on a completely clear plateau with no obstacles between you and the horizon, you would see much farther from the greater height than you would on the ground.
This phenomenon is caused by the curvature of the Earth as well, and would not happen if the Earth was flat.
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3. The existence of time zones
We have time zones because when the Sun is illuminating one side of the spherical Earth, the other side is dark. This can only be explained if the world is round, and rotating around its own axis. At a certain point when the sun is shining on one part of the Earth, the opposite side is dark, and vice versa. That allows for time differences and time zones, specifically ones that are larger than 12 hours.
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