Discussion on the origin of right ascension.

Details Discussion on the origin of right ascension. Discussion on the origin of right ascension.

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mgeo...17...65y&link_type=abstract

Manuscr. Geod., Vol. 17, No. 1, p. 65 - 86

Astronomy and Astrophysics

Astronomy

Scientific paper

The definition, mathematical representation, properties and coordinate transformation of the Departure Point in a quasi-inertial geocentric equatorial coordinate system (QIGECS) defined on the moving true equator are discussed in detail, in this paper. A nutational right ascension precession introduced by the Departure Point might become a new term of the precession in right ascension. The application of the Departure Point to Universal Time and Terrestrial Reference System is discussed more deeply. But it is also found that the adoption of the Departure Point does not entirely eliminate procession and nutation uncertainties and this problem becomes serious with the development of time if we do not refer to the equinox to correct it. In a supplementary manner the Departure Point can find its usage in some fields of astronomical measurement specially in the Earth Orientation Parameters, but it cannot completely replace the equinox ultimately. A quite general discussion of this topic and a further detailed application of the Departure Point to the Earth Rotation are given in Yan and Groten (1992).

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