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precession    音标拼音: [pris'ɛʃən]
n. 先行,优先,岁差

先行,优先,岁差

precession
n 1: the motion of a spinning body (as a top) in which it
wobbles so that the axis of rotation sweeps out a cone
2: the act of preceding in time or order or rank (as in a
ceremony) [synonym: {precession}, {precedence}, {precedency}]

Precession \Pre*ces"sion\, n. [L. praecedere, praecessum, to go
before: cf. F. pr['e]cession. See {Precede}.]
The act of going before, or forward.
[1913 Webster]

{Lunisolar precession}. (Astron.) See under {Lunisolar}.

{Planetary precession}, that part of the precession of the
equinoxes which depends on the action of the planets
alone.

{Precession of the equinoxes} (Astron.), the slow backward
motion of the equinoctial points along the ecliptic, at
the rate of 50.2[sec] annually, caused by the action of
the sun, moon, and planets, upon the protuberant matter
about the earth's equator, in connection with its diurnal
rotation; -- so called because either equinox, owing to
its westerly motion, comes to the meridian sooner each day
than the point it would have occupied without the motion
of precession, and thus precedes that point continually
with reference to the time of transit and motion.
[1913 Webster]


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  • Precession - Wikipedia
    In astronomy, precession refers to any of several slow changes in an astronomical body's rotational or orbital parameters An important example is the steady change in the orientation of the axis of rotation of the Earth, known as the precession of the equinoxes
  • (7) Precession - NASA
    Precession of a spinning scientific payload (also known as its "coning"--from "cone"--or its "nutation") is an unwelcome feature, because it complicates the tracking of its instruments To eliminate it, such satellites use "nutation dampers," small tubes partially filled with mercury
  • Understanding Precession - University of California, Los Angeles
    Instead, the gyroscope tips slightly down and begins to rotate around the pivot This rotation is called precession Upon looking closer, a careful observer will notice that as the gyroscope precesses its tip also rotates up and down This motion is known as nutation
  • 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
  • Precession | Earth’s Axis, Astronomy, Celestial Mechanics | Britannica
    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 of a spinning top is precession, the uneven wobbling is
  • What is Precession? - AllTheScience
    Any alteration in the position of a celestial body's rotation axis is known as precession Astronomical bodies naturally feature slow changes in both their rotational rate and orbital status around other gravitationally-strong bodies
  • 6. 7: Precession - Physics LibreTexts
    The precession of \(\text{P}\) around \(\text{K}\) means that the entire system of equatorial coordinates (right ascension and declination) moves continuously, and the right ascensions and declinations of all the stars are continuously changing
  • Notes on Precession in Astronomy - Coconino Astro
    Precession 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 The Earth slowly wobbles, much as a top, or gyroscope, does when spun This wobble is called the Earth's Precession
  • Astronomy: precession of earth - Washington State University
    The physical cause of the precession is a torque (twisting) of the earth, caused mostly by the sun's and the moon's gravity pulling on the equatorial bulges of the earth If earth were NOT spinning, the sun and moon would pull the earth so that the bulges were flat in the sun-earth orbital plane
  • Axial precession - Wikipedia
    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 axial parallelism [2]





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