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Topic: Precession of the equinoxes

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Equatorial coordinate system

Declination

Inclination

Spring equinox

Ecliptic

Celestial sphere

Geoid

Physical geodesy

Tropical zodiac

Celestial coordinate system

Moon

Celestial navigation

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Spheroid

International date line

	Precession of the Equinoxes - Crystalinks
		The precession of the equinoxes is caused by the differential gravitation forces of Sun and Moon on Earth.
		The precession of the equinoxes can cause periodic climate change (see Milankovitch cycles), because the hemisphere that experiences summer at perihelion and winter at aphelion (as the southern hemisphere does presently) is in principle prone to more severe seasons than the opposite hemisphere.
		Precession causes the cycle of seasons (tropical year) to be about 20.4 minutes less than the period for the earth to return to the same position with respect to the stars as one year previously (sidereal year).
	www.crystalinks.com /precession.html (2028 words)

	Precession - Wikipedia, the free encyclopedia
		Precession is the resultant of the angular velocity of rotation and the angular velocity produced by the torque.
		Discrepancies between the observed perihelion precession rate of the planet Mercury and that predicted by classical mechanics were prominent among the forms of experimental evidence leading to the acceptance of Einstein's Theory of Relativity, which predicted the anomalies accurately.
		The precession of the orbit of the Earth is an important part of the astronomical theory of ice ages.
	en.wikipedia.org /wiki/Precession (1300 words)

	AllRefer.com - precession of the equinoxes (Astronomy, General) - Encyclopedia
		precession of the equinoxes, westward motion of the equinoxes along the ecliptic.
		B.C. The precession is due to the gravitational attraction of the moon and sun on the equatorial bulge of the earth, which causes the earth's axis to describe a cone in somewhat the same fashion as a spinning top.
		The precession of the earth's orbital plane is sometimes called planetary precession, and that of the earth's equatorial plane (caused by the sun and moon) is called luni-solar precession; the combined effect of the moon, the sun, and the planets is called general precession.
	reference.allrefer.com /encyclopedia/P/precequi.html (454 words)

	Precession of the equinoxes - Wikipedia, the free encyclopedia
		The precession of the Earth is not entirely regular due to the fact that the Sun and Moon are not in the same plane and move relative to each other, causing the torque they apply to Earth to vary.
		The precession of the equinoxes can cause periodic climate change (see Milankovitch cycles), because the hemisphere that experiences summer at perihelion and winter at aphelion (as the southern hemisphere does presently) is in principle prone to more severe seasons than the opposite hemisphere.
		Precession causes the cycle of seasons (tropical year) to be about 20.4 minutes less than the period for the earth to return to the same position with respect to the stars as one year previously (sidereal year).
	en.wikipedia.org /wiki/Precession_of_the_equinoxes (931 words)

	Vernal equinox, Platonic year, Vernal Equinox, precession of the equinoxes, great year
		It is also referred to as the precession of the equinoxes or the great year in a comprehensive dictionary.
		This is known as the precession of the equinoxes.
		As the precession continues, Alpha Draconis, which is also known as the Dragon Star or Thuban, becomes the next North Pole star after Vega around the year A.D. Alpha Draconis aligns closer to the North Pole axis of our Earth than all of the other pole stars in a Platonic year.
	www.revealer.com /platonic.htm (1606 words)

	Precession
		To astronomers precession is mainly another factor to be taken into account when aiming a telescope or drawing a star chart; but to believers in astrology, the "dawning of the age of Aquarius" is a great portent and may mark the beginning of a completely new and different era.
		The axis of the cone is perpendicular to the plane of the ecliptic.
		The cause of the precession is the equatorial bulge of the Earth, caused by the centrifugal force of the Earth's rotation (the centrifugal force is discussed in a later section).
	www-istp.gsfc.nasa.gov /stargaze/Sprecess.htm (2050 words)

	II.7 Precession of the Equinoxes (Site not responding. Last check: 2007-10-21)
		The motion of the equinoxes which causes the difference between the solar and sidereal year is going on all the time.
		The precession of the equinoxes arises from the fact that the direction of the earth’s axis in space is slowly changing.
		The two equinoxes will make a revolution round the equator in the same period of time, being carried along by the earth's equator, which is always at right angles to the earth's axis.
	www.physics.csbsju.edu /astro/newcomb/II.7.html (639 words)

	PRECESSION OF THE EQUINOXES - LoveToKnow Article on PRECESSION OF THE EQUINOXES (Site not responding. Last check: 2007-10-21)
		The equinox being defined as the point of intersection of the equator and ecliptic, its motion arises from the fact that both of these great circles are in continuous though slow motion.
		The motion of the ecliptic is due to the action of the planets on the earth, which produces a slow progressive change in the position of the plane of the earths orbit, and therefore of the ecliptic.
		The direction of the motion around this axis is such that from the limits 353 through 0 to 173, which includes the vernal equinox, the motion is towards the south, while, in the remainder of the circle, it is towards the north.
	www.1911ency.org /P/PR/PRECESSION_OF_THE_EQUINOXES.htm (552 words)

	Astrology - Precession of the Equinoxes - © Dr Shepherd Simpson
		Vernal Equinox Point and hence the movement is the Movement of the Vernal Equinox Point.
		However Hipparchos did not realise that this was due to the Precession of the Earth itself.
		The Precession of the Equinoxes, causes the Movement of the Ages.
	www.geocities.com /astrologyages/precessionequinoxes.htm (722 words)

	precession
		The component of precession caused by the Sun and Moon is called lunisolar precession; that caused by the action of the planets is called planetary precession.
		The sum of lunisolar and planetary precession, known as general precession, results in a westward movement of the equinoxes (the nodes of the ecliptic) known as the precession of the equinoxes.
		Precession means that a number of different stars in the circumpolar regions of the celestial sphere serve as pole stars on a cyclical basis.
	www.daviddarling.info /encyclopedia/P/precession.html (283 words)

	Voyage 5
		As the Sun moves eastward along the ecliptic, it is at the V.E. on March 21, the S.S. on June 21, the A.E. on September 21, and the W.S. on December 21.
		This is known as the precession of the equinoxes.
		This motion is caused primarily by the gravitational pull of the Moon on the Earth’s equatorial bulge.
	www.physics.emich.edu /jwooley/chapter5/Chapter5.html (564 words)

	The Copernican Series
		The Precession of the Equinoxes, then, is a movement that follows the orbit of the Earth around the sun rather than the sun's north-south-north movement as a result of the Earth's tilt.
		Precession therefore must be caused by some effect of the Earth that occurred at the same position in the Earth's orbit every year simply because precession was fixed by the sun and the tilt of the Earth at that position.
		Astronomers use Newton's explanation for precession, wobble, to explain the Precession of the Equinoxes, when all it would explain, if it is true, is that Virgo will be the north star some day, and not necessarily in 13,000 years because wobble does not provide a basis for the computation of a precessional cycle.
	www.copernican-series.com /precession.html (6688 words)

	Precession and Nutation (Site not responding. Last check: 2007-10-21)
		By far the largest effect is the so-called ``precession of the equinoxes'', where the Earth's rotation axis sweeps out a cone centred on the ecliptic pole, completing one revolution in about 26,000 years.
		It is a common misconception that precession is caused by the Sun and nutation is caused by the Moon.
		In fact the Moon is responsible for two-thirds of the precession, and, while it is true that much of the complex detail of the nutation is a reflection of the intricacies of the lunar orbit, there are nonetheless important solar terms in the nutation.
	star-www.rl.ac.uk /star/docs/sun67.htx/node206.html (756 words)

	PRECESSION OF THE EQUINOXES (Site not responding. Last check: 2007-10-21)
		The equinoxes do not occur at the same points of the ecliptic every year, for the plane of the ecliptic and the plane of the equator revolve in opposite directions, respectively.
		This movement of the equinoxes along the ecliptic is called the precession of the equinoxes.
		However, because a star's position may change slightly due to the precession of the equinoxes, such tables must be revised at regular intervals.
	www.math.ubc.ca /~cass/courses/m309-01a/tsang/precession.html (932 words)

	Your Sky Help: Precession (Site not responding. Last check: 2007-10-21)
		Since the Earth's axis of rotation is inclined 23.5° to the ecliptic (the plane in which it orbits the Sun), the radius of the circle traced out by the north pole in the sky is the same: 23.5°.
		Precession is often called "the precession of the equinoxes", since one of its most obvious consequences is the slow progression of the position of the Sun at the time of the equinoxes from constellation to constellation over the centuries.
		Precession is both the bane and the guaranteed meal ticket of the positional astronomer.
	www.fourmilab.ch /yoursky/help/precession.html (347 words)

	CONSTELLATIONS, PRECESSION, SIDEREAL ZODIAC, TROPICAL ZODIAC (Site not responding. Last check: 2007-10-21)
		Their year began with the Spring Equinox, and so it made sense to pick that point that is, the point in the sky where the Sun appeared to be at the time of the Spring Equinox, as the reference point, and then divide the ecliptic into 12 equal segments from there.
		The Greeks were well aware of the precession of the equinoxes; however, as their system of astrology was based on the seasonal cycles, it did not concern them.
		And finally, the argument that astrology can't work because the precession of the equinoxes make it invalid, or at least wildly inaccurate (which is essentially what the "scientist" was referring to who prompted Debbie's question), simply brings up the difference between the Tropical and the Sidereal Zodiacs.
	astro-horoscopes.net /HTML/AskKevin/980116.html (3007 words)

	Precession--lesson plan #11
		A brief study of the precession of the equinoxes and of its possible link to the occurrence of ice ages.
		The precession of spinning satellites is undesirable, since it confuses the observations.
		The waving of these antennas gradually made the satellite precess around its spin axis, and the cone of precession grew wider, until in the end it was essentially flat and the satellite spun around an axis perpendicular to it, through its middle.
	www-istp.gsfc.nasa.gov /stargaze/Lprecess.htm (1723 words)

	Precession of the Equinoxes (Site not responding. Last check: 2007-10-21)
		The argument of the Precession of the Equinoxes is one frequently made by those opposed to astrology, who claim that it ‘disproves’ astrology and renders it invalid.
		The point referred to by Astronomers as the vernal equinox, and by astrologers as 0 degrees Aries is in fact seen each year from the earth as slightly before its previous year's position against the background of the constellations.
		This is caused by a wobble in the earth's axis, caused by unequal gravitational pull of the Sun and the Moon on the earth's surface.
	www.elysian.co.uk /precessi.htm (817 words)

	Equinoxes - Precession of the equinoxes - Facts from the Encyclopedia - Yahoo (Site not responding. Last check: 2007-10-21)
		Figure 6h-1: Position of the equinoxes, solstices, aphelion, Figure 6h-4: During the equinoxes, the axis of the Earth is not tilted toward or away from
		Equinoxes are days in which day and night are of equal duration.
		Precession of the equinoxes - westward motion of the equinoxes along the ecliptic.
	www.iseeklinks.com /q/equinoxes.htm (252 words)

	Anomalous Precessions
		One hope that Einstein had throughout the time he was working on the general theory was that it would explain the anomalous precession of Mercury. Of course, as we've seen, "explanations" of this phenomenon were never in short supply, but none of them were very compelling, all seeming to be ad hoc.
		In contrast, Einstein found that the extra precession arises unavoidably from the fundamental principles of general relativity.
		Calculation gives for the planet Mercury a rotation of the orbit of 43" per century, corresponding exactly to the astronomical observation (Leverrier); for the astronomers have discovered in the motion of the perihelion of this planet, after allowing for disturbances by the other planets, an inexplicable remainder of this magnitude.
	www.mathpages.com /rr/s6-02/6-02.htm (1025 words)

	From Pisces to Aquarius: The precession of the equinoxes, by Rick Roark; Share International Archives
		They will further agree that, by virtue of the present position of the earth’s precession with the sun to the distant constellations of the Zodiac, the earth-sun system is now in a transition period, moving from the Age of Pisces into the Age of Aquarius.
		This directed pulsation of the planar-line is a correlation of three cyclic activities: the pulse or rhythm of the elliptical orbit of the earth, the activity of earth’s rotation, and the activity of earth’s precession.
		As a matter of scientific interest (but beyond the scope of this article), the particular spatial pattern created by the rhythmic pulsation of the planar-line is a teardrop shape not unlike the receiving pattern of a modern radio frequency antenna used throughout the modern world to receive unidirectional electromagnetic radio transmissions.
	www.shareintl.org /archives/Science-tech/sci_rrPisces2Aquarius.htm (1273 words)

	II. Egyptian Sky Charts
		He distinguishes the knowledge of the precession of the axis of the world from that of the concomitant phenomenon of the precession of the equinoxes.
		Abstractly it is conceivable that a culture could be aware of the precession of the axis of the world and of the precession of the equinoxes with out connecting the two phenomena.
		If the precession and its rate was known to Plato, this information must be of pre-Greek origin, since the Greeks of that age certainly did not have the means and the organization to proceed to the necessary astronomical observations.
	www.metrum.org /key/pyramids/second.htm (3895 words)

	precession of the equinoxes
		Precession is the same effect you see with a top.
		As the precession of the axis occurs, the orientation of the celestial equator will also change, since it is necessarily perpendicular to the axis.
		urrently, the vernal equinox is in Pisces; and at the cusp of Aquarius.
	www.carnaval.com /precession (1550 words)

	Precession of the Equinox, Virgin Birth, Astronomy, astrology, pi, solar system
		Precession is directly related to Pi and the geometry of a circle.
		Precession Note: Our present estimation of the length of a year (365.2422 days) is less than the length of a "Sidereal" Cycle by approximately 20 minutes.
		Precession also enhances the idea of a dynamic and organic living presence in our shifting universe.
	www.flex.com /~johnboy/Preces.htg/precession.htm (630 words)

	Precession of the Earth's Rotation Axis (Site not responding. Last check: 2007-10-21)
		The Earth's rotation axis happens to be pointing almost exactly at Polaris now, but in 13,000 years the precession of the rotation axis will mean that the bright star Vega in the constellation Lyra will be approximately at the North Celestial Pole, while in 26,000 more years Polaris will once again be the Pole Star.
		Because of the precession of the equinoxes, the vernal equinox moves through all the constellations of the Zodiac over the 26,000 year precession period.
		Presently the vernal equinox is in the constellation Pisces and is slowly approaching Aquarius.
	csep10.phys.utk.edu /astr161/lect/time/precession.html (295 words)

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