Editing Lunar phase (section)

===Lunar libration===
[[File:Lunar libration with phase Oct 2007 (continuous loop).gif|thumb|right|240px|Animation showing progression of the Moon's phases.]]

As seen from Earth, the Moon's eccentric orbit makes it both slightly change its apparent size, and to be seen from slightly different angles.

The effect is subtle to the naked eye, from night to night, yet somewhat obvious in time-lapse photography.

Lunar libration causes part of the back side of the Moon to be visible to a terrestrial observer some of the time. Because of this, around 59% of the Moon's surface has been imaged from the ground.
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