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- Lunar_precession abstract "Precession is the change in direction of an axis of rotation with respect to a reference plane. The orbit of the Moon has two important such precessional motions. Nodal precessionThe first precession is movement of the plane of the lunar orbit. The period of the lunar nodal precession is defined as the time it takes the ascending node to move through 360 degrees relative to the vernal equinox. It is about 18.6 years and the direction of motion is westward, ie. in the same direction as the Earth's orbit around the sun. This is the reason that a draconic month or nodal period ( the period of time that the Moon takes to return to the same node in its orbit ) 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 to return to the same lunar node, the eclipse year, is about 18.6377 days shorter than a sidereal year. The number of solar orbits ( years ) during one lunar nodal precession period equals the period of orbit ( one year ) divided by this difference, minus one. 365.25/18.6377 - 1 Apsidal precessionThe second precession is that of the major axis of the Moon's elliptical orbit ( the line of the apsides from perigee to apogee ) , which precesses eastward by 360 degrees in approximately 8.85 years. 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 "2758".
- Lunar_precession wikiPageOutDegree "21".
- Lunar_precession wikiPageRevisionID "700842491".
- Lunar_precession wikiPageWikiLink Apsis.
- Lunar_precession wikiPageWikiLink Category:Orbit_of_the_Moon.
- Lunar_precession wikiPageWikiLink Eclipse_cycle.
- Lunar_precession wikiPageWikiLink Lunar_month.
- Lunar_precession wikiPageWikiLink Lunar_theory.
- Lunar_precession wikiPageWikiLink March_equinox.
- Lunar_precession wikiPageWikiLink Moon.
- Lunar_precession wikiPageWikiLink Nodal_period.
- Lunar_precession wikiPageWikiLink Orbit.
- Lunar_precession wikiPageWikiLink Orbit_of_the_Moon.
- Lunar_precession wikiPageWikiLink Precession.
- Lunar_precession wikiPageWikiLink Sidereal_year.
- Lunar_precession wikiPageWikiLink File:Lunar_eclipse_diagram-en.svg.
- Lunar_precession wikiPageWikiLink File:Lunar_standstill.GIF.
- Lunar_precession wikiPageWikiLink File:Moon_apsidal_precession.png.
- Lunar_precession wikiPageWikiLinkText "18.6 and 8.85 years".
- 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 wikiPageUsesTemplate Template:Moon-stub.
- Lunar_precession subject Category:Orbit_of_the_Moon.
- Lunar_precession hypernym Change.
- Lunar_precession type Organisation.
- Lunar_precession comment "Precession is the change in direction of an axis of rotation with respect to a reference plane. The orbit of the Moon has two important such precessional motions. Nodal precessionThe first precession is movement of the plane of the lunar orbit. The period of the lunar nodal precession is defined as the time it takes the ascending node to move through 360 degrees relative to the vernal equinox. It is about 18.6 years and the direction of motion is westward, ie.".
- Lunar_precession label "Lunar precession".
- Lunar_precession sameAs Q6703824.
- Lunar_precession sameAs m.01k6t8.
- Lunar_precession sameAs Q6703824.
- Lunar_precession wasDerivedFrom Lunar_precession?oldid=700842491.
- Lunar_precession depiction Lunar_standstill.GIF.
- Lunar_precession isPrimaryTopicOf Lunar_precession.