regression of nodes

regression of nodes The westward movement of the nodes of an orbit, caused by the gravitational pull of other bodies, particularly the Sun. For example, the nodes of the Moon's mean orbit regress once around the ecliptic in 18.6 years.

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"regression of nodes." A Dictionary of Astronomy. 1997. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

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