The lunar eclipse happens when the Moon goes through the Earth's shadow. Earth dependably has a shadow, which is made by the Sun. On those uncommon events when the Moon, Earth and the Sun are altogether arranged perfectly, the Moon goes through this shadow.This would happen each full moon if the Moon circled around the Earth in an indistinguishable plane from the Earth circles around the Sun.
A lunar eclipse occurs when the Moon moves through the Earth's umbra. Earth ever has an umbra, that is produced by the Sun. On those rare moments, while the Moon, Earth and the Sun are wholly fixed up just accurate, the Moon moves through this umbra. This would occur every entire moon if the Moon revolving about the Earth in the corresponding plane as the Earth circles around the Sun.
