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Secular Variations in Optical Observations of Planets: Summary

Published online by Cambridge University Press:  07 August 2017

P. K. Seidelmann
P. K. Seidelmann*
Affiliation:
U.S. Naval Observatory

Extract

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The conversion in 1984 from constants, reference frames, time scales, and ephemerides, all essentially based on theories and constants by Newcomb, to the IAU 1976 system of constants, new definitions of time scales, FK5 reference system, and integrated ephemerides has produced the expected accuracy improvements. These changes included a correction to the precession constant of 1.13 arcseconds per century, a correction to the equinox motion of the FK4 of 1.23 arcseconds per century, and a new expression for the Greenwich Mean Sidereal time.

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