Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...215..181s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 215, no. 1, May 1989, p. 181-189.
Astronomy and Astrophysics
Astrophysics
7
Earth Rotation, Long Term Effects, Lunar Eclipses, Solar Eclipses, Angular Velocity, Rotating Bodies, Secular Variations, Solar Observatories, Velocity Distribution
Scientific paper
Data from solar and lunar eclipse observations obtained by Islamic astronomers during the period AD 829-1019 are compiled in tables and analyzed to estimate nontidal variations (NTVs) in the earth rotation rate. The data set and computational procedures are described in detail, and the results are presented in graphs. The average length of the day in AD 950 is found to be 11.6 + or - 0.6 msec shorter than the present standard value (86,400 sec), consistent with an increase of 1.37 + or - 0.07 msec/century over the intervening period. The latter value is less than that predicted for tidal friction alone or that estimated on the basis of ancient Babylonian records (Stephenson and Morrison, 1984); significant long-term NTVs are inferred.
Said Sylvère
Stephenson Richard F.
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