What If the Earth Was Flat?

Like the other planets, the Earth is a sphere. It rotates around its own axis slowly but continuously, and completes this rotation about once every 24 hours. As the Earth rotates, part of the Earth is facing the sun, and part of it faces away. This is why some parts of the world have day and night at different times.There are a number of reasons why scientists know that the Earth is round, and not flat. It turns out that we can test many of these reasons out for ourselves, too.