A derivation of the rate of spin-down of the earth using ancient Chinese records of central eclipses

Details A derivation of the rate of spin-down of the earth using ancient Chinese records of central eclipses A derivation of the rate of spin-down of the earth using ancient Chinese records of central eclipses

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984acaps...4..107h&link_type=abstract

(Acta Astrophysica Sinica, vol. 4, no. 2-3, 1984, p. 107-114) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 8, Dec.

Astronomy and Astrophysics

Astrophysics

1

Earth Rotation, Solar Eclipses, China, Ephemeris Time, Records, Space Observations (From Earth)

Scientific paper

A method for studying the variation in the rotation of the earth in historical times using ancient records of central solar eclipses is described. From the records of central eclipses covering a period of some 1400 years (7th century BC to 7th century AD), given in the Chinese annals, 88 entries are selected and used to calculate the rotation variation parameter Delta T. It is shown that the earth is spinning down at a relative rate of -(1.88 + or - 0.10) x 10 to the -10th/yr.

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