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Topic: J2000

Julian epoch

Julian day

Proper motion

True north

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	J2000.0 - Facts, Information, and Encyclopedia Reference article
		The earlier epoch that was in standard use was the B1950.0 epoch.
		Novices are sometimes confused by finding that the Earth's rotational North pole does not point quite at the J2000 celestial pole at the epoch J2000.0; the reason is that the true pole of epoch suffers nutation ("is nutated") away from the mean one.
		The "J" in the prefix indicates that it is a Julian epoch, as opposed to a Besselian epoch.
	www.startsurfing.com /encyclopedia/j/2/0/J2000.html (196 words)

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