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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
  • 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
  • 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 - NASA
    Hipparchus concluded that the intersection marking the equinox slowly crept forward along the ecliptic, and called that motion "the precession of the equinoxes " The rate is about one full circle in 26 000 years
  • Why Does Earths Axis of Rotation Wobble? - Astronomy Magazine
    While most of us are familiar with our planet’s primary motions — rotation (spinning once a day) and revolution (orbiting the Sun once a year) — few are aware of precession To see this
  • 6. 7: Precession - Physics LibreTexts
    The precession of P around 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
  • Earths Wobble Wreaks Havoc on Astronomers--And Astrologers, Too
    This visualization shows Earth’s axial precession, a wobble in the planet’s rotational axis with a period of about 26,000 years that is induced by tidal forces from the sun and moon
  • Precession – Doyles Space
    Precession is the gradual change or wobble in the orientation of an object’s rotational axis Imagine a spinning top; over time, its spinning axis wobbles around, tracing out a cone-like shape
  • 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
  • PRECESSION Definition Meaning - Merriam-Webster
    The meaning of PRECESSION is a comparatively slow gyration of the rotation axis of a spinning body about another line intersecting it so as to describe a cone





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