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Variations in rotation of the earth, results obtained with the dual-rate moon camera and photographic zenith tubes

Published online by Cambridge University Press:  14 August 2015

Wm. Markowitz
Wm. Markowitz*
Affiliation:
U. S. Naval Observatory, Washington, D. C.

Abstract

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Comparison of photographic zenith tube (P.Z.T.) observations with time derived from quartz-crystal clocks during 1951 to 1955 and with cesium standards of frequency during 1955 to 1958 indicates that the seasonal variation is nearly the same from year to year. Lunar-tidal inequalities of semi-monthly and monthly periods with amplitudes of about 0S.001 each were found. A preliminary value of the Love number, k, is derived. Observations made since 1952 with the dual-rate moon position camera are used to derive ΔT = ET – UT. Comparison of the P.Z.T. observations and atomic standards at the National Physical Laboratory and the Naval Research Laboratory shows details of the irregular variation from 1955 to 1958.

Type
Part II. The Rotation of the Earth
Information
Symposium - International Astronomical Union , Volume 11: The Rotation of the Earth and Atomic Time Standards , 1959 , pp. 26 - 33
Copyright
Copyright © American Astronomical Society 1959 

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