Axial precession (astronomy) - Wikipedia, the free encyclopedia
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In astronomy, axial precession is a gravity-induced, slow and continuous change in the orientation of an astronomical body's rotational axis. In particular, it refers to the gradual shift in the ori...
en.wikipedia.org/wiki/Axial_precession_(astronomy)
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I have read that the direction of axis changes n h ... The celestial equator -- projection of Earth's equator onto the sky -- moves with the precession. The equator is always at 90 degrees from the poles. If the orientation of the poles changes (with the orientation of the axis), then the equator must also change along.
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answers.yahoo.com/question/index?qid=20080717044534AAxN...
answers.yahoo.com/question/index?qid=20080717044534AAxNXTr
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Hipparchus concluded that the intersection marking the equinox slowly crept forward along the ecliptic, and called that motion "the precession of the equinoxes. " ... But overall the notion that ice ages may be linked to the motion of the Earth through space may be currently our best guess concerning the causes of ice ages.
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www-istp.gsfc.nasa.gov/stargaze/Sprecess.htm
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Precession is due to the law of conservation of angular momentum. Momentum is what you get if you multiply the mass of an object by how fast it is moving, so a bullet has a lot because it's moving very fast, and a steamroller has a lot beca...
http://www.bbc.co.uk/dna/h2g2/A622531
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Precession is due to the law of conservation of angular momentum. Momentum is what you get if you multiply the mass of an object by how fast it is moving, so a bullet has a lot because it's moving very fast, and a steamroller has a lot because it's very heavy. ... What Causes Precession?
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www.bbc.co.uk/dna/h2g2/pda/A622531?s_id=5
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In popular science books one often finds this explained with the analogy of the precession of a spinning top. Indeed it is the same physical effect, however, some crucial details differ. In a spinning top it is gravity which causes the top to wobble which in its turn causes precession.
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www.crystalinks.com/precession.html
www.crystalinks.com/precession.html
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Taken in conjunction with the 26000-year spin-axis precession, the 71000-year orbit precession causes a 41000-year oscillation in the tilt of the earths axis, about plus or minus 1.3 degrees from its average value of 23.3 degrees.
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astro.wsu.edu/worthey/astro/html/lec-precession.html
astro.wsu.edu/worthey/astro/html/lec-precession.html
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The precession angular velocity is inversely proportional to the spin angular velocity, so that the precession is faster and more pronounced as the top slows down. ... Anything that causes the precession angular momentum to be a bit off vertical will lead to a kind of "precession of the precession."
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www.4physics.com/phy_demo/top/top.html
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PRECEDENTIAL; Filed March 6, 2003; UNITED STATES COURT OF APPEALS; FOR THE THIRD CIRCUIT; No. 99-1324; AMERICAN CIVIL LIBERTIES UNION; ANDROGYNY BOOKS, INC. d/b/a A DIFFERENT LIGHT; BOOKSTORES; AMERICAN BOOKSELLERS FOUNDATION; FOR FREE EXPRESSION; ARTNET WORLDWIDE; CORPORATION; BLACKSTRIPE; ... (Opinion filed March 6,
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www.ca3.uscourts.gov/opinarch/991324.pdf
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