Sunrise and sunset Earth to the Moon

it is known that the Moon is always facing the Earth on one side, but for someone who is on the Moon, the Earth will not hang motionless in the sky. This is due to the fact that, firstly, the moon's orbit is not circular, but elliptical, and secondly, the axis of rotation inclined to the axis of the moon's orbit around the Earth.

Thanks to these small movements are generalized called libration, the observer on Earth is available for review in the aggregate approximately 60% of the lunar surface. In turn, the observer located on the border of the lunar disk, can see the sunrise and sunset Earth. See also: In our galaxy there are 500 million planets, potentially suitable for life. It discovered the first potentially habitable planets. A solar flare in 2012 will not destroy the Earth.

Source: muzey-factov.ru/tag/moon#4519