The definition of the ecliptic

Details The definition of the ecliptic The definition of the ecliptic

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983cemec..31..329k&link_type=abstract

Celestial Mechanics (ISSN 0008-8714), vol. 31, Dec. 1983, p. 329-338.

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9

Astronomical Coordinates, Ecliptic, Solar Orbits, Astrometry, Kinematic Equations, Solar Velocity

Scientific paper

The ecliptic as a mean orbital plane of the Sun in Le Verrier's theory is a mean orbital plane determined from the secular parts of the longitude of the ascending node and the inclination of the Sun with respect to a reference plane. On the other hand, the ecliptic in Newcomb's theory is so chosen that the latitude with respect to his ecliptic does not have cos g nor sin g where g is the mean anomaly of the Sun. The two definitions are really different in spite of their apparent similarity. Standish (1981) defined the ecliptic from a kinematical point of view, and it is shown that the ecliptic defined by Standish (in the rotating sense) does coincide with the ecliptic defined by Newcomb.

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