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Topic: Hipparchic cycle

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	Eclipse cycle - Wikipedia, the free encyclopedia
		This orbital period is called the anomalistic month, and together with the synodic month causes the so-called "full moon cycle" of about 14 lunations in the timings and appearances of Full (and New) Moons.
		In itself a poor cycle, it is very convenient in the classification of eclipse cycles.
		It is the interval after which the Moon's eclipses recur with respect to the lunar calendar and at the same longitudes as the previous cycle.
	en.wikipedia.org /wiki/Eclipse_cycle (1622 words)

	ECLIPSE CYCLE FACTS AND INFORMATION
		;Metonic cycle or Enneadecaeteris: This is nearly equal to 19 tropical_years, but is also 5 "octon" periods and close to 20 eclipse years: so it yields a short series of eclipses on the same calendar date.
		So the next eclipse will be visible from a location close to the first one; in contrast to the saros, when the eclipse occurs ''ca.'' 8h later on the day and about 120° West of the first one.
		;Hipparchic cycle: Not a very remarkable eclipse cycle, but Hipparchos constructed it to closely match an integer number of anomalistic months, years (345), and days.
	www.witwib.com /eclipse_cycle (1517 words)

	lunar cycles
		Although known earlier in Babylon and China, the cycle is named for the Greek astronomer Meton (5th century bce), who wrote a book titled Enneadecaterides on the cycle.
		The Callipic cycle of 76 years, or 940 lunations, or 27,759 days, or in other words 4 Metonic cycles, was introduced by the Greek astronomer Callippus of Cyzicus (about 370 bce-300 bce), a friend of Aristotle’s, in about 334 bce.
		Despite the improved accuracy the Callipic cycle it did not win wide use; it remained a consideration of scholars rather than calendar makers.
	www.sizes.com /time/lunar_cycles.htm (635 words)

	Inex [Definition] (Site not responding. Last check: 2007-11-05)
		Of course the Sun is also near a node at that time: the same node in case of a solar eclipse, the opposite node in case of a lunar eclipse.
		The traditional concept arose with the cycle of moon phases; such months are synodic months and last ~29.53 days.
		Not a very remarkable eclipse cycle, but HipparchosHipparchus (Greek Ἳππαρχος) (circa 190 BC – circa 120 BC) was a Greek astronomer, geographer, and mathematician.
	www.wikimirror.com /Inex (2626 words)

	History
		However, given a nominal twelve-month year, an additional lunar months needed to be added to synchronize the cycle.
		These were added in years 3, 5, 8, 11, 13, 16, and 19 of the cycle.
		Hipparchus noted that an even more accurate cycle (now called the Hipparchic Cycle) consisted of four Callipic Cycles less a day, in which days were very nearly 3760 months.
	www.info-galaxy.com /Holiday/History/history.html (722 words)

	Eclipse cycle - the free encyclopedia (Site not responding. Last check: 2007-11-05)
		full moon cycle" of about 14 lunations in the timings and appearances of Full (and New) Moons.
		This is a fairly decent short eclipse cycle, but poor in anomalistic returns.
		A comprehensive page with eclipse cycles is at:
	www.free-web-encyclopedia.com /?t=Inex (1533 words)

	MATHORIGINS.COM_C
		I wonder if in the 47 [annus vagus] years from the close of the Sothic Cycle to the close of a Solar Cycle, did the AE priests note any variance in the equinox?
		This is because of its lunar system, where every year consists of exactly 12 moon cycles.
		The other common name of the Muslim calendar is "hijra", referring to the fleeing of the Prophet Muhammad and his followers from Mecca to Yathrib (later Madina).
	www.mathorigins.com /C.htm (2321 words)

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