Earth Rotation Measured by Lunar Laser Ranging

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Science  10 Sep 1976:
Vol. 193, Issue 4257, pp. 997-999
DOI: 10.1126/science.193.4257.997


The estimated median accuracy of 194 single-day determinations of the earth's angular position in space is 0.7 millisecond (0.01 arc second). Comparison with classical astronomical results gives agreement to about the expected 2-millisecond uncertainty of the 5-day averages obtained by the Bureau International de l'Heure. Little evidence for very rapid variations in the earth's rotation is present in the data.