- How do we fall?
-The world cannot be moving 'up' with an acceleration of ~9.81 m/s, or else it would be going faster than light right now. (It must be an acceleration, a constant speed would not make us fall, since that would be incorporated into our jumping velocity.)
-The existence of an intrinsic 'down' would cause the Earth, and other planets to fall that way, which would yield the same results as the point above. Also, macro matter clearly attracts, as per what we can see in the universe.
-How do you explain the refraction of light through the atmosphere to produce colors only consistent with a curved atmosphere?
-If the Earth is flat, and has edges, what's keeping the atmosphere on the 'top'?
-Why can I take a flight from Britain, to Germany, to china, to america to Britain, without going back on myself?
-Why are there varying star constellations in different parts of the world?
-Why can we see farther from higher? Human view distance is potentially infinite, we can see stars that are very, very, very, very, very far away. Why can we see things on Earth that are further away when we are higher up?
-Why are time Zones polar? It's never the case that no part of the earth is without the sun. Why is that so? If the Earth was flat either we wouldn't have varying days and nights or there would come a point where NONE of the Earth has light.
-How would the "Foucault Pendulum" work if the Earth was either accelerating, or there was an intrinsic down?
-If we've never been to space, why does my GPS work?
---More importantly: During lunar eclipses (when the Earth’s orbit places it directly between the Sun and the Moon, creating a shadow in the process), the shadow on the Moon’s surface (cause by the earth) is round.
Since the earth is rotating (see the “Foucault Pendulum” experiment for a definite proof, if you are doubtful), the consistent oval-shadow it produces in each and every lunar eclipse proves that the earth is not only round but spherical.
---If you stick a stick in the ground, it will produce a shadow. The shadow moves as time passes. If the world had been flat, then two sticks in different locations would produce the same shadow.
But they don’t. This is because the earth is round, and not flat.
---Consider a sphere. Since a sphere has a consistent shape, no matter where on it you stand, you have exactly the same amount of sphere under you. Imagine an ant walking around on a crystal ball. Assuming the crystal ball is polished, the ant’s only indication of movement would be the fact it’s moving its feet. The scenery (and shape of the surface) would not change at all.
Consider a flat plane. The center of mass of a flat plane is in its center (more or less – if you want to be more accurate, feel free to do the entire integration process), and the force of gravity will pull a person toward the middle of the plain. That means that if you stand on the edge of the plane, gravity will be pulling you toward the middle, not straight down like you usually experience.
I am quite positive that even for Australians an apple falls downwards, but if you have your doubts, I urge you to try it out – just make sure it’s nothing that can break or hurt you. Just in case gravity is consistent after all.