Titan Chamber, Xiniu Cave (Guanxi) - China China Caves 2013 3D Project Expedition Team - 12.09.2013

Wednesday, May 16, 2012

Lunar Libration

The Moon generally has one hemisphere facing the Earth, due to tidal locking. Therefore, humans' first view of the far side of the Moon resulted fromlunar exploration in the 1960s. However, this simple picture is only approximately true: over time, slightly more than half (about 59%) of the Moon's surface is seen from Earth due to libration.
Libration is manifested as a slow rocking back and forth of the Moon as viewed from Earth, permitting an observer to see slightly different halves of the surface at different times.

File:Lunar libration with phase Oct 2007 450px.gif