The motion of the earth-moon system in modern tabular ephemerides. II - Inertial motion, mean longitude of the sun, and general precession in longitude

Details The motion of the earth-moon system in modern tabular ephemerides. II - Inertial motion, mean longitude of the sun, and general precession in longitude The motion of the earth-moon system in modern tabular ephemerides. II - Inertial motion, mean longitude of the sun, and general precession in longitude

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130..211s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 2, Jan. 1984, p. 211-226.

Astronomy and Astrophysics

Astrophysics

12

Celestial Mechanics, Earth-Moon System, Ephemerides, Ephemeris Time, Inertial Reference Systems, Precession, Astronomical Coordinates, Coordinate Transformations, Correction, Earth Motion, Orbital Mechanics, Solar Longitude, Earth-Moon System, Motion, Celestial Mechanics, Ephemerides, Precession, Models, Calculations, Comparisons, Inertia, Motion, Coordinate Systems

Scientific paper

Properties of astronomical time scales are primarily based upon Newcomb's (1898) expression for the mean "of-date" longitude of the Sun (i.e. the longitude relative to the mean equinox of date). By definition, the of-date longitude should be given by the sum of: 1) the inertial mean longitude relative to the mean equinox of a fixed epoch, and 2) the general precession in longitude accumulated since that epoch. It is the main purpose of this paper to investigate the extent to which this condition is fulfilled. As main result, an unresolved inconsistency of about 1arcsec per century (i.e. of the same order as the recent revision of the precession constant) among the mean inertial motion of DE 102, the new IAU precession speed, and the classical Newcomb of-date mean motion is noted and brought to the attention of the astronomical community. Interpretation difficulties stemming from implicitly different systems of Ephemeris Time are discussed.

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