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- Axial_precession abstract "In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis. In particular, it refers to the gradual shift in the orientation of Earth's axis of rotation, which, similar to a wobbling top, traces out a pair of cones joined at their apices in a cycle of approximately 26,000 years. The term "precession" typically refers only to this largest part of the motion; other changes in the alignment of Earth's axis – nutation and polar motion – are much smaller in magnitude.Earth's precession was historically called the precession of the equinoxes, because the equinoxes moved westward along the ecliptic relative to the fixed stars, opposite to the yearly motion of the Sun along the ecliptic. This term is still used in non-technical discussions, that is, when detailed mathematics are absent. Historically, Hipparchus has been credited with discovering precession of the equinoxes, although evidence from cuneiform tablets suggest that his statements and mathematics relied heavily on Babylonian astronomical materials that had existed for many centuries prior. The exact dates of his life are not known, but astronomical observations attributed to him by Ptolemy date from 147 BC to 127 BC.With improvements in the ability to calculate the gravitational force between and among planets during the first half of the nineteenth century, it was recognized that the ecliptic itself moved slightly, which was named planetary precession, as early as 1863, while the dominant component was named lunisolar precession. Their combination was named general precession, instead of precession of the equinoxes.Lunisolar precession is caused by the gravitational forces of the Moon and Sun on Earth's equatorial bulge, causing Earth's axis to move with respect to inertial space. Planetary precession (an advance) is due to the small angle between the gravitational force of the other planets on Earth and its orbital plane (the ecliptic), causing the plane of the ecliptic to shift slightly relative to inertial space. Lunisolar precession is about 500 times greater than planetary precession. In addition to the Moon and Sun, the other planets also cause a small movement of Earth's axis in inertial space, making the contrast in the terms lunisolar versus planetary misleading, so in 2006 the International Astronomical Union recommended that the dominant component be renamed, the precession of the equator, and the minor component be renamed, precession of the ecliptic, but their combination is still named general precession. Many references to the old terms exist in publications predating the change.".
- Axial_precession thumbnail Earth_precession.svg?width=300.
- Axial_precession wikiPageExternalLink nph-bib_query?bibcode=1977A%26A....58....1L&db_key=AST&data_type=HTML&format=&high=46303c7cf308007.
- Axial_precession wikiPageExternalLink nph-bib_query?bibcode=1994A%26A...282..663S&db_key=AST&data_type=HTML&format=&high=46303c7cf308007.
- Axial_precession wikiPageExternalLink ?pa=content&sa=viewDocument&nodeId=962&bodyId=1147.
- Axial_precession wikiPageExternalLink aa03_412_P03.pdf.
- Axial_precession wikiPageExternalLink cm06_94_PEWG.pdf.
- Axial_precession wikiPageExternalLink precession.htm.
- Axial_precession wikiPageID "72576".
- Axial_precession wikiPageRevisionID "606713413".
- Axial_precession hasPhotoCollection Axial_precession.
- Axial_precession subject Category:Celestial_mechanics.
- Axial_precession subject Category:Precession.
- Axial_precession subject Category:Technical_factors_of_astrology.
- Axial_precession type Abstraction100002137.
- Axial_precession type Beginning107290905.
- Axial_precession type Cause107326557.
- Axial_precession type Event100029378.
- Axial_precession type Factor107327805.
- Axial_precession type Happening107283608.
- Axial_precession type Origin107323922.
- Axial_precession type PsychologicalFeature100023100.
- Axial_precession type TechnicalFactorsOfAstrology.
- Axial_precession type YagoPermanentlyLocatedEntity.
- Axial_precession comment "In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis. In particular, it refers to the gradual shift in the orientation of Earth's axis of rotation, which, similar to a wobbling top, traces out a pair of cones joined at their apices in a cycle of approximately 26,000 years.".
- Axial_precession label "Axial precession".
- Axial_precession label "Precesión de los equinoccios".
- Axial_precession label "Precesja planetarna".
- Axial_precession label "Precessione degli equinozi".
- Axial_precession label "Precessão dos equinócios".
- Axial_precession label "Précession des équinoxes".
- Axial_precession label "Zyklus der Präzession".
- Axial_precession label "Предварение равноденствий".
- Axial_precession label "مبادرة محورية".
- Axial_precession label "歲差 (天文)".
- Axial_precession sameAs Precese_zemské_osy.
- Axial_precession sameAs Zyklus_der_Präzession.
- Axial_precession sameAs Μετάπτωση_των_ισημεριών.
- Axial_precession sameAs Precesión_de_los_equinoccios.
- Axial_precession sameAs Précession_des_équinoxes.
- Axial_precession sameAs Precessione_degli_equinozi.
- Axial_precession sameAs 자전축의_세차운동.
- Axial_precession sameAs Precesja_planetarna.
- Axial_precession sameAs Precessão_dos_equinócios.
- Axial_precession sameAs m.0jkn4.
- Axial_precession sameAs Q83094.
- Axial_precession sameAs Q83094.
- Axial_precession sameAs Axial_precession.
- Axial_precession wasDerivedFrom Axial_precession?oldid=606713413.
- Axial_precession depiction Earth_precession.svg.
- Axial_precession isPrimaryTopicOf Axial_precession.