Non-seasonal changes in the rate of rotation of the earth.

Details Non-seasonal changes in the rate of rotation of the earth. Non-seasonal changes in the rate of rotation of the earth.

Dec 1953

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1953aj.....58..217s&link_type=abstract

Astronomical Journal, Vol. 58, p. 217

Astronomy and Astrophysics

Astronomy

Scientific paper

The rate of rotation of the earth, in addition to changes of a seasonal character, is known to be subject to a slow secular decrease and to irregular changes which appear to be of a random character. These irregular changes limit the accuracy with which the secular change can be determined. The result of the discussion by Brouwer and van Woerkom is a secular acceleration of the moon of +2'.'2 9'.'5 (m.e.) and of the sun $I'.'0I + o'.'70 (m.e.) per century. The theoretical discussion by Jeffreys requires the ratio of these secular accelerations to have a value 5.0 or greater. But Holmberg has drawn attention to an investigation by Kelvin in 1882 and shown that the phase of the atmospheric tidal oscillation is such that there is an accelerating couple on the earth. When this is taken into consideration the theoretical ratio of the secular accelerations of the moon and sun can be brought into agreement with the observed values. Royal Greenwich Observatory, Herstmonceux Castle, Nr. Hailsham, Sussex, England.

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