these people are nuts....read this
Physics of a Flat Earth
The modern Flat Earth Society describes the Earth as being a disk with a diameter of about 24,900 miles and a circumference of 78,225 miles. The sun and moon are both disks about 32 miles in diameter (though some sources say that the sun and moon are spheres) and are about 3,000 miles above the Earth, and the stars about 100 miles above the sun and moon.
The Flat Earth Society also maintains that the Earth is accelerating upward at a rate of 9.8 m/s², thereby simulating gravity. This upward momentum is caused by the "Universal Accelerator", a vague term used by the Society to describe a force that originated at the Big Bang and caused the Earth to speed upwards. Gravity cannot exist on a flat Earth since the disc shape would eventually collapse on itself. However, other planetary bodies such as the moon and the sun have gravitational pulls, causing the gravitational force on an object to decrease as it increases in altitude. This also allows spacecraft to "orbit".
The planetary bodies above the Earth revolve above it, thereby causing sunrise and sunset to occur. As the sun moves farther away, it shrinks until it is no longer able to be seen. The same phenomenon occurs with the stars to cause their movement.
The society's Flat Earth hypothesis states that as a ship moves farther away, the chance of a wave being in front of the ship relative to a viewer's perspective on shore increases. Therefore, because the ship moves farther away and becomes smaller, a wave is able to obscure a larger portion of the hull until the ship is no longer visible. Other factors that also contribute to this effect is atmospheric distortion and human eyesight.
The exact explanation for lunar eclipses in the Flat Earth theory is vague, however, a two commonly accepted theories are Shadow Object Theory (that an object undiscovered by science obscures the moon causing moon phases and lunar eclipses) and Reflection Theory (the sun's light reflects off the Earth and reflects back to the moon, with some areas of the Earth being less reflective than others, thus producing shadows).
Tides are caused by a slight tilting of the Earth, causing water to "slosh" back and forth. The tilt is very small, and very unlikely to be noticed.
As the sun orbits over the Earth, the Flat Earth theory maintains that the sun's orbit radius changes, causing it to be directly overhead different locations at different times of the year.
Gravity in the Flat Earth is caused by constant acceleration upwards of everything in the universe, as per Einstein's equivalence principle.
for more go here http://en.wikipedia.org/wiki/Flat_Earth_Society
or the actual site
http://www.alaska.net/~clund/e_djublonskopf/Flatearthsociety.htm
