http://www.theflatearthsociety.org/tiki/tiki-index.php?page=Why+the+Lunar+Eclipse+is+Red"The globular earth is said have a circumference of 24,900 miles while the atmosphere is said to extend only 100 miles around it. If the RE model were true, and the redness of the shadow was caused by the sun's light filtering through the earths atmosphere, then the earth's shadow upon the moon would only have a slight sliver of red around the shadow's edges."
What the hell are they talking about? Farther the object is, the greater is the area the light illuminates. And the Earths atmosphere, that disperses the light, is 400000 km away from the Moon, and no image is created on the Moon. Suppose you tried to project an image of a red ring using a projector in a dark room and that the large plane it is projected on is much farther than the image is. What do you expect to see on a screen? Of course it will be entirely reddish.