- Slow gyration of the Earth’s spin axisPrecession is the slow gyration of the Earth’s spin axis, due to the gravitational pull of the Moon, Sun and planets on the unevenly distributed mass of the Earth.coconinoastro.org/PDF/Precession.pdf
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前往 Wikipedia 查看全部内容Axial precession - Wikipedia
The precession of the equinoxes is caused by the gravitational forces of the Sun and the Moon, and to a lesser extent other bodies, on the Earth. It was first explained by Isaac Newton. Axial precession is similar to the precession of a spinning top. In both cases, the applied force is due to gravity. For a spinning top, this force … 展开
In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis. In the absence of precession, the astronomical body's orbit would show 展开
Hellenistic world
Hipparchus
The discovery of precession usually is attributed to Hipparchus (190–120 BC) of Rhodes or 展开The term "Precession" is derived from the Latin praecedere ("to precede, to come before or earlier"). The stars viewed from Earth are seen to proceed … 展开
The precession of the Earth's axis has a number of observable effects. First, the positions of the south and north celestial poles appear to move in circles against the space-fixed backdrop of … 展开
Hipparchus gave an account of his discovery in On the Displacement of the Solsticial and Equinoctial Points (described in Almagest III.1 and VII.2). He measured the ecliptic 展开
The images at right attempt to explain the relation between the precession of the Earth's axis and the shift in the equinoxes. These images show the position of the Earth's axis on the 展开
CC-BY-SA 许可证中的维基百科文本 Precession - Wikipedia
Precession is a change in the orientation of the rotational axis of a rotating body. In an appropriate reference frame it can be defined as a change in the first Euler angle, whereas the third Euler angle defines the rotation itself. In other words, if the axis of rotation of a body is itself rotating about a second axis, that body is said to be precessing about the second axis. A motion in which the second Euler angle changes is called nutation. In physics, there are two types of precession: torque-free …
Wikipedia · CC-BY-SA 许可下的文字Milankovitch (Orbital) Cycles and Their Role in Earth’s Climate
2020年2月27日 · Precession – As Earth rotates, it wobbles slightly upon its rotational axis, like a slightly off-center spinning toy top. This wobble is due to tidal forces caused by the …
(7) Precession - NASA
The cause of the precession is the equatorial bulge of the Earth, caused by the centrifugal force of the Earth's rotation (the centrifugal force is discussed in a later section). That rotation changes the Earth from a perfect sphere to a slightly …
Astronomy: precession of earth - Washington State …
Learn how the earth's spin axis wobbles and changes its orientation over time, affecting the seasons, the stars, and the climate. Explore the causes, consequences, and cycles of precession with graphs and examples.
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NASA SVS | Earth Orientation Animations
2012年12月27日 · Nutation and Precession: Nutation and precession are the periodic and long-term motion of the Earth's spin axis in space. The direction of the Earth's axis in space, shown in orange, changes over time with respect to …
Precession | Earth’s Axis, Astronomy, Celestial …
precession, phenomenon associated with the action of a gyroscope or a spinning top and consisting of a comparatively slow rotation of the axis of rotation of a spinning body about a line intersecting the spin axis. The smooth, slow circling …
precession of the equinoxes - Encyclopedia Britannica
Precession was the third-discovered motion of Earth, after the far more obvious daily rotation and annual revolution. Precession is caused by the gravitational influence of the Sun and the Moon acting on Earth’s equatorial bulge. To a …
Currently, the Earth’s axis precesses 360 degrees in 25,772 years and this length of time is called the precessional cycle or period. However, this motion does not change the 23.5o tilt of the …
AstroPages | Precession | Western Washington University
Around 130 BC a greek astronomer named Hipparchus estimated the length of the cycle of Earth's precession by comparing his own observations to those recorded by Babylonian and Chaldean astronomers in the preceding centuries.
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