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- Lunar_precession abstract "Precession is the rotation of a plane (or its associated perpendicular axis) with respect to a reference plane. The orbit of the Moon has two important such precessional motions. Nodal precessionThe first precession is the turning of lunar orbit, the orientation of lunar orbit inclination. This motion determines the period of the lunar nodes; that is, the line along which the plane of the Moon's orbit and that of Earth's orbit intersect. This nodal period is about twice as long (about 18.6 years) as the apsidal precession period discussed below, and the direction of motion is Westward. This is the reason that a draconic month (the period of time that the Moon takes to return to the same node) is shorter than the sidereal month. After one nodal precession period, the number of draconic months exceeds the number of sidereal months by exactly one. This period is about 6,793 days (18.60 years).As a result of this nodal precession, the time for the Sun-Earth-Moon alignment to return to the same node, the eclipse year, is about 18.6377 days shorter than a sidereal year. The number of solar orbits during one turn of lunar orbit equals the period of orbit divided by this difference minus one. Apsidal precessionSecond the long axis (line of the apsides: perigee and apogee) of the Moon's elliptical orbit precesses eastward by one full cycle in just approximately 8.85 years. It is caused by the solar tide. This is the reason that an anomalistic month (the period of time that the Moon moves from the perigee to the apogee and to the perigee again) is longer than the sidereal month (the period of time when the Moon completes one revolution with respect to the fixed stars). This apsidal precession completes one rotation in the same time as the number of sidereal months exceeds the number of anomalistic months by exactly one, after about 3233 days (8.85 years).".
- Lunar_precession thumbnail Lunar_standstill.GIF?width=300.
- Lunar_precession wikiPageID "242681".
- Lunar_precession wikiPageLength "2725".
- Lunar_precession wikiPageOutDegree "23".
- Lunar_precession wikiPageRevisionID "682464714".
- Lunar_precession wikiPageWikiLink Anomalistic_month.
- Lunar_precession wikiPageWikiLink Apogee.
- Lunar_precession wikiPageWikiLink Apsides.
- Lunar_precession wikiPageWikiLink Apsis.
- Lunar_precession wikiPageWikiLink Category:Orbit_of_the_Moon.
- Lunar_precession wikiPageWikiLink Draconic_month.
- Lunar_precession wikiPageWikiLink Eclipse_cycle.
- Lunar_precession wikiPageWikiLink File:Lunar_standstill.GIF.
- Lunar_precession wikiPageWikiLink Lunar_month.
- Lunar_precession wikiPageWikiLink Lunar_node.
- Lunar_precession wikiPageWikiLink Lunar_theory.
- Lunar_precession wikiPageWikiLink Moon.
- Lunar_precession wikiPageWikiLink Nodal_period.
- Lunar_precession wikiPageWikiLink Orbit.
- Lunar_precession wikiPageWikiLink Orbit_of_the_Moon.
- Lunar_precession wikiPageWikiLink Perigee.
- Lunar_precession wikiPageWikiLink Precession.
- Lunar_precession wikiPageWikiLink Sidereal_year.
- Lunar_precession wikiPageWikiLink Sun.
- Lunar_precession wikiPageWikiLink Tidal_force.
- Lunar_precession wikiPageWikiLink File:Lunar_eclipse_diagram-en.svg.
- Lunar_precession wikiPageWikiLink File:Moon_apsidal_precession.png.
- Lunar_precession wikiPageWikiLinkText "lunar cycle".
- Lunar_precession wikiPageWikiLinkText "lunar precession".
- Lunar_precession wikiPageWikiLinkText "precess".
- Lunar_precession wikiPageWikiLinkText "precesses".
- Lunar_precession wikiPageWikiLinkText "precession of nodes".
- Lunar_precession wikiPageWikiLinkText "precession".
- Lunar_precession hasPhotoCollection Lunar_precession.
- Lunar_precession wikiPageUsesTemplate Template:Moon-stub.
- Lunar_precession subject Category:Orbit_of_the_Moon.
- Lunar_precession hypernym Rotation.
- Lunar_precession comment "Precession is the rotation of a plane (or its associated perpendicular axis) with respect to a reference plane. The orbit of the Moon has two important such precessional motions. Nodal precessionThe first precession is the turning of lunar orbit, the orientation of lunar orbit inclination. This motion determines the period of the lunar nodes; that is, the line along which the plane of the Moon's orbit and that of Earth's orbit intersect.".
- Lunar_precession label "Lunar precession".
- Lunar_precession sameAs m.01k6t8.
- Lunar_precession sameAs Q6703824.
- Lunar_precession sameAs Q6703824.
- Lunar_precession wasDerivedFrom Lunar_precession?oldid=682464714.
- Lunar_precession depiction Lunar_standstill.GIF.
- Lunar_precession isPrimaryTopicOf Lunar_precession.