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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
  • Precession - NASA
    International Solar Terrestrial Physics (ISTP) historical material, hosted by NASA's Goddard Space Flight Center Heliophysics Division of the Sciences and Exploration Directorate in Greenbelt Maryland USA
  • 11. 5: Precession of a Gyroscope - Physics LibreTexts
    Example 11 5 1: Period of Precession A gyroscope spins with its tip on the ground and is spinning with negligible frictional resistance The disk of the gyroscope has mass 0 3 kg and is spinning at 20 rev s Its center of mass is 5 0 cm from the pivot and the radius of the disk is 5 0 cm What is the precessional period of the gyroscope? Strategy We use Equation 11 5 5 to find the precessional
  • 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
  • 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
  • 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
  • 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 Two types of precession exist within the realm of astronomy: torque-free and torque-induced
  • 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





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