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When you see a lunar eclipse, you are seeing Earth's shadow on the Moon. The shadow is round, which provides a clue (but is not complete evidence) of the shape of the Earth.
If you watch a ship on the horizon, it will eventually disappear. If the Earth was flat, it would get smaller and smaller but would not disappear. This can only be explained if the Earth is round.
There are certain constellations visible from both the Northern and Southern hemispheres. There are constellations visible only from the Northern Hemisphere, and there are constellations visible only from the Southern Hemisphere. This would not happen if the world was flat.
You can see further the higher up you are. If you go to a field perfectly clear of obstacles and look as far as you can see, you would not see as much as you would if you were higher up. This is proof that the Earth is round.
Our planet was created by the same processes as other planets, and they are round.
Time zones cannot be explained with a flat Earth.
Gravity. If the Earth was flat, gravity would be acting towards the centre of that flat plane meaning gravity would start to pull you sideways as you travel further towards the edge. This does not happen.
Photographs taken from space show that the Earth is round.
All this evidence in favour of a round Earth, and zero evidence in favour of a flat Earth, so we can categorically state that the Earth is not flat
