Round Earth: 99.9% of all people believe that Earth is round. I am well aware that this does not make it so, but it has been proven and is referred to as a fact. I do not observe both theories narrow mindedly. If someone show me irrefutable proof for a theory, then I will accept it as fact. Serveral experiments which you can do yourself are:
(1): Next time you are on a commercial airline flight, observe the curvature of the horizon. Some people say that this is not visible, but at a high altitude it can be seen clearly. The reason why some people can see it and some can't, is because some people's eyes are more sensitive to VERY slight curvature than others.
(2): Watch a ship as it slowly appears to sink below the horizon. On a flat Earth this would not happen.
(3): Trails from planes are always curved from horizon to horizon. If the Earth were flat, this would not happen.
(4): Look up at this sky and clouds. You will get the impression of a dome.
Flat Earth:
(1): Look at the ground and horizon, it looks quite flat.
(2): Observe ships as they appear to sink below the horizon, this is nothing more than an illusion created by the atmosphere.
(3): Look at the moon with a telescope. It appears as a two dimensional disc.
(4): Explain gravity. The Earth is constantly accellerating, this presses down on everything on the surface.
If you compare these pieces of evidence, you will find that the Round Earth theory (or fact, as it must therefore be called) is clearly the winner. What some people also are not aware of is that the Earth is not a perfect sphere, so it cannot really be called "Round".