Variations in the Rate of Rotation of the Earth

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Science  04 Jun 1971:
Vol. 172, Issue 3987, pp. 1022-1025
DOI: 10.1126/science.172.3987.1022


Variations observed in the length of the day can be divided into three types: seasonal, irregular, and long-term. The astronomical data examined here for the years 1956-1969 suggest that the seasonal terms hitherto assumed are slightly in error, that the irregular variations probably share the same source with the seasonal variations, and that the long-term variations may be linked to earthquake activity.