Equinox (celestial coordinates): Difference between revisions

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In the case of orbital elements for objects within the [[Solar System]], only a few of the classical orbital elements are affected by a switch of equinox: the [[longitude of the ascending node]] and (to a much lesser extent) the [[orbital inclination|inclination]]. If another set of orbital elements are used, such as the position and velocity vectors for a particular epoch, all components can be affected by a switch of equinox.{{Citation needed|reason=Your explanation here|date=December 2018}}
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The currently used standard equinox and epoch is J2000.0, which is January 1, 2000 at 12:00 [[Terrestrial Time|TT]]. The prefix "J" indicates that it is a Julian epoch. The previous standard equinox and epoch was B1950.0, with the prefix "B" indicating it was a Besselian epoch. Before 1984 Besselian equinoxes and epochs were used. Since that time Julian equinoxes and epochs have been used.<ref name="Equinoccicc">{{cite book |url=https://books.google.com/?id=WDjJIww337EC&pg=PA20&lpg=PA20&dq=julian+epoch+equinox |title=Astronomy on the Personal Computer, p. 20 |accessdate=JulyJanuary 1323, 20072019 |isbn=9783540672210 |last1=Montenbruck |first1=Oliver |last2=Pfleger |first2=Thomas |date=2009-03-232005 | edition =corrected 3rd printing of 4th }}</ref>
 
== Motion of the equinox ==