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Topic: Mean longitude

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	Longitude Did You Mean longitude? (Site not responding. Last check: 2007-10-11)
		Longitude is given as an angular measurement ranging from 0° at the Prime Meridian to +180° eastward and ?180° westward.
		Ecliptic longitude is measured from 0° to 360° eastward (the direction that the Sun appears to move relative to the stars) along the ecliptic from the vernal equinox.
		Ecliptic longitude relative to a moving equinox is used whenever the positions of the Sun, Moon, planets, or stars at dates other than that of a fixed equinox is important, as in calendars, astrology, or celestial mechanics.
	www.did-you-mean.com /Longitude.html (1791 words)

	History & info - the Chinese calendar
		This means that principles of modern science have had an impact on the Chinese calendar.
		This means that the year wu-yin, the 15th year in the 78th cycle, started on 28 Jan 1998.
		Inequalities in the Moon's motions were incorporated as early as the seventh century C.E., but the Sun's mean longitude was used for calculating the solar terms until 1644.
	webexhibits.org /calendars/calendar-chinese.html (2102 words)

	Planet positions using elliptical orbits (via CobWeb/3.1 planetlab1.netlab.uky.edu) (Site not responding. Last check: 2007-10-11)
		The presession of the equinoxes means that the 'zero' of RA is changing slowly with time, which means that star coordinates must always be referred to an epoch, or date.
		The mean anomaly tells us where the planet would be given mean motion in a circular orbit of radius equal to the semimajor axis.
		With 'peak to mean ratios' like those in the table, you might guess that a time series graph of error against position date would show a complex behaviour, not a simple monotonic rise with time from the date of the elements.
	www.stargazing.net.cob-web.org:8888 /kepler/ellipse.html (3672 words)

	[No title]
		To account for these effects, a fictitious sun, "The Mean Sun," was invented: it moves with uniform velocity in the plane of the Earth's equator, with the same average speed as the true Sun.
		GMT (Greenwich Mean Time): This term is a historic term which is in a strict sense obsolete, though often used (although not in astronomy, e.g., BBC still uses this abbreviation for patriotic reasons ;-) as a synonym for UTC.
		Prior to 1925, it was reckoned for astronomical purposes from Greenwich mean noon (12h UT).
	sciastro.astronomy.net /sci.astro.3.FAQ (6903 words)

	Asteroid Masses
		They have also been very close together ever since they were discovered at the beginning of the nineteenth century; the separation in mean longitude has increased from 1° in 1802 to only 43° in Dec. 1997.
		The perturbation effect most easily observed is the change in the mean motion of the test body.
		Observing a change this small requires that an excellent orbit be determined for the test body both before and after the encounter with the massive asteroid.
	aa.usno.navy.mil /hilton/asteroid_masses.htm (1082 words)

	Mars Fact Sheet
		Semimajor axis (AU) 1.52366231 Orbital eccentricity 0.09341233 Orbital inclination (deg) 1.85061 Longitude of ascending node (deg) 49.57854 Longitude of perihelion (deg) 336.04084 Mean Longitude (deg) 355.45332
		) 11.3 12.40 *Mean orbital distance from the center of Mars.
		If no sub- or superscripts appear on this page - for example, if the "Mass" is given in units of "(1024 kg)" - you may want to check the notes on the sub- and superscripts.
	nssdc.gsfc.nasa.gov /planetary/factsheet/marsfact.html (503 words)

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