Axial precession

Precessional movement of Earth. Earth rotates (white arrows) once a day around its rotational axis (red); this axis itself rotates slowly (white circle), completing a rotation in approximately 26,000 years

The relationship between the apses, seasons and precession of Earth's axis, as viewed from the north. The seasons indicated pertain to the Northern Hemisphere and are reversed for the Southern Hemisphere. The tilt of Earth's axis and the eccentricity of its orbit are exaggerated.

Precession of Earth's axis around the north ecliptical pole

Precession of Earth's axis around the south ecliptical pole

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 can refer 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.

单词	Precession Of the Equinoxes
释义	Precession Of the Equinoxes 原声例句原来如此的故事 One fine morning in the middle of the Precession of the Equinoxes this 'satiable Elephant's Child asked a new fine question that he had never asked before. 一个晴朗的早晨，在岁差的中间，这个“贪得无厌的大象之子”问了一个他以前从未问过的新问题。英语百科 Axial precession 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 can refer 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.
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Precession Of the Equinoxes

Axial precession