An eclipse happens when the moon's shadow falls on the earth. The darkest part of the moon's shadow is very small, only tens of kilometers wide, and only in that darkest part (umbra) do the people there see a total eclipse. If they see a partial eclipse, only part of the sun is covered by the Moon. You can watch our show "Earth's Wild Ride" to see an explanation of eclipses. You can watch it free or get more info on the show by going to: http://www.spaceupdate.co...tml#earths_wild_ride

It also shows what a solar eclipse would look like from an observer on the moon!