Abstract
Summary The ‘decade’ fluctuations in the Earth's rate of rotation are derived from a comparison of the universal time-scale, based on the Earth's diurnal rotation, with: (a) the dynamical time-scale of the lunar ephemeris from 1861 to 1955 (using the collected times of occultations of stars), and (b) the international atomic time-scale from 1955 to 1978. It is concluded from these fluctuations that the torques which operated on the Earth's mantle varied in magnitude in a characteristic period of about 30 yr and reached a maximum of 1018Nm around 1900.
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