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Topic:
J2000
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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)
Try your search on:
Qwika
(all wikis)
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