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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
    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
  • Understanding Precession - University of California, Los Angeles
    This precession can be explained rela-tively easily using simple Newtonian mechan-ics as a result of the conservation of an-gular momentum However, in addition to neglecting to explain the origin of the tops nutation, this mathematical explana-tion doesn't make it any easier to under-stand how the gyroscope de es gravity1 This leaves many rst year physics students (in-cluding the author
  • 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
  • AstroPages | Precession | Western Washington University
    Precession of the Equinox Source: University of Hong Kong Dept of Physics The circle and dates above is the path that the celestial north pole describes during a complete cycle of the precession Source: Tauʻolunga
  • 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
  • PRECESSION | English meaning - Cambridge Dictionary
    PRECESSION definition: 1 the slow and continuous change in the rotation (= movement around a fixed point) of a planet… Learn more
  • Nutation and Precession | Earth
    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 extremely distant objects, such as quasars When measured with respect to these distant objects, the spin axis appears to trace a circle in the celestial sphere over a long period of time (approximately
  • What Is Precession How Does It Change The Climate
    Precession is a natural phenomenon where Earth wobbles slightly upon its rotational axis, similar to a spinning toy top This wobble is caused by tidal forces from the Sun and Moon, which cause Earth to bulge at the equator, affecting its rotation
  • Precession of the Earths Rotation Axis
    This precession of the equinoxes means that the right ascension and declination of objects changes very slowly over a 26,000 year period This effect is negligibly small for casual observing, but is an important correction for precise observations
  • Precession Overview, Causes Consequences - Study. com
    Precession is the cyclic change in Earth's rotational axis, amounting to roughly 1° every 72 years One major effect of precession is that, at different times during the cycle, the seasons will





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