Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988acaps...8..147l&link_type=abstract
(Acta Astrophysica Sinica, vol. 8, 1988, p. 147-155) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 12, Sept. 1988, p
Astronomy and Astrophysics
Astrophysics
Earth Rotation, Lunar Occultation, Secular Variations, Astronomical Catalogs, Brightness, Lunar Tides, Solar System
Scientific paper
Ancient Chinese lunar occultation records with only dates but without exact times of observation were studied by the "Really Visible Time" method. An examination for their reality and implication was made and 58 occultations of planets and 113 occultations of stars occuring before the 6th century were selected to determine the parameters of the Earth's rotation. Useful limits of Δt can be obtained from the records of planets and bright stars. Δt, the difference between UT and ET, and ω, the acceleration of the Earth's rotation, were obtained separately for the 1st, 4th, 5th and 6th centuries. The mean acceleration is found to be -66.8 ± 3.2 sec/century2. The adopted lunar tidal acceleration n= -26arcsec/century2 and the fundamental epoch of ωis assumed to be 1800.0. The mean observational epoch is 341 A.D.
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