The Earth is not flat. Scientifically speaking, Earth is an oblate spheroid and there is a wealth of understanding and scientific evidence to prove this. First is the observation of the horizon. When boats sail away to see, they disappear from bottom to top and when they approach, we can see the top side first. This is just one simple evidence of why the Earth is not flat. There is also circumnavigation, where one can start and end travelling from one certain point on the Earth's surface, there is also the shape of the shadow of the Earth, flight paths, gravity, satellite imagery, Eratosthenes' measurement and the Earth's gravity field. These are certain evidences proving that the Earth is not flat and will never be.