The secular acceleration of the earth's spin

Details The secular acceleration of the earth's spin The secular acceleration of the earth's spin

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jhatd...6..120n&link_type=abstract

Johns Hopkins APL Technical Digest (ISSN 0270-5214), vol. 6, Apr.-June 1985, p. 120-129.

Other

Angular Acceleration, Earth Rotation, Lunar Tides, Secular Variations, Solar Rotation, Angular Velocity, Gravitational Constant, Solar Eclipses, Torque

Scientific paper

The spin rate of the Earth varies constantly. Daily changes are associated with atmospheric winds; long-term changes are related to lunar and solar tidal friction and other slowly changing geophysical parameters. The changes in the Earth's spin rate reported here have occurred over periods measured in centuries and are based on observations in historical astronomical texts. The (negative) secular spin acceleration was -19.8 parts per billion per century around the year 600 AD and is now -8.6 parts per billion. These changes in spin rate are due to contributions from tidal friction and from an effect proportional to the square of the time-varying magnetic dipole of the Earth. When these contributions are subtracted from the observed acceleration, a residual contribution of +41 parts per billion per century remains that is probably due to variations in the diameter of the Earth's core and other geophysical changes.

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