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Topic: Ecliptical pole

Related Topics

Deep Ecliptic Survey

Ecliptic coordinate system

ecliptic longitude

ecliptic plane

Obliquity of the ecliptic

ecliptical pole

North Ecliptic Pole

Ecliptic year

south ecliptic pole

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	Hipparchus
		In his star map Hipparchus drew the position of every star on the basis of its celestial latitude (its angular distance from the ecliptic plane) and its celestial longitude (its angular distance from an arbitrary point, for instance as is custom in astronomy from vernal equinox).
		Lunisolar precession causes the motion of point γ by the ecliptic in the opposite direction of the apparent solar year's movement and the circulation of celestial pole.
		This is planetary precession where the ecliptical plane swings from its central position for ±4° in 60,000 years.
	www.nebulasearch.com /encyclopedia/article/Hipparchus.html (6438 words)

	Encyclopedia :: encyclopedia : Hipparchus (astronomer) (Site not responding. Last check: 2007-10-31)
		Their ecliptic latitudes β remained unchanged, but their ecliptic longitudes λ had increased, at a rate which he estimated to be at least one degree per century.
		Since Ptolemy's copy in the Almagest is given in ecliptical coordinates, that system would seem the most likely; although there is evidence that both ecliptic coordinates and equatorial coordinates were used in the original observations.
		The diameter of this circle is equal to the inclination of ecliptic relative to the celestial equator.
	www.hallencyclopedia.com /Hipparchus_(astronomer) (6859 words)

	The Lunar Planner: The Asteroids including Pluto Orcus Varuna Quaoar Ixion Xena (Site not responding. Last check: 2007-10-31)
		Quaoar's near circular orbit and mild orbital inclination of 8° (as compared to Pluto's highly elliptical orbit and severing 17° inclination) indicates a gentle and harmonious nature, perhaps one inspiring the need to bring into a centered harmony and balance that which is chaotically scattered.
		It lies south of the ecliptic in Hydra, in later sidereal Cancer, and under the auspices of the Head of the Lion.
		The precessional movement of Earth's pole, the God Head, governs the movement of the Birthplace (the vernal point) of the soul consciousness.
	www.lunarplanner.com /asteroids.html (6547 words)

	[No title]
		Hipparchus also observed solar equinoxes, which may be done with an equatorial ring: its shadow falls on itself when the Sun is on the equator (i.e.
		Additionally, as first in the history he correctly explained this with retrogradical movement of vernal point γ over the ecliptic for about 45", 46" or 47" (36" or 3/4' according to Ptolemy) per annum (today's value is Ψ'=50.387", 50.26") and he showed the Earth's axis is not fixed in space.
		He also noticed this motion in other stars.
	www.informationclub.com /encyclopedia/h/hi/hipparchus.html (6529 words)

	Hipparchus - Gurupedia (Site not responding. Last check: 2007-10-31)
		nova star in the constellation of Scorpius, he measured with an equatorial armillary sphere ecliptical coordinates of about 850 (falsely quoted elsewhere as 1600 or 1080) and in 129 BC he made first big star catalogue.
		That poem, known as Phaenomena or Arateia, describes the constellations and the
		By comparing his own measurements of the position of the equinoxes to the star Spica during a lunar eclipse at the time of equinox with those of Euclid's contemporaries (Timocharis of Alexandria (circa 320 BC-260 BC), Aristyllus 150 years earlier, the records of Chaldean astronomers (especially Kidinnu's records), and observations of a temple in
	www.gurupedia.com /h/hi/hipparchus.htm (6645 words)

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