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Comparisons of ET(solar), ET(lunar), UT, and TDT

Published online by Cambridge University Press:  03 August 2017

Wm. Markowitz
Wm. Markowitz*
Affiliation:
Nova University, 2800 E. Sunrise Blvd., Apt. 15 B, Fort Lauderdale, FL 33304, USA

Summary

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A fundamental dynamical scale, ET(solar), was formed from absolute, meridian circle observations, from 1835 to 1982. At 1967.0 the ET(solar) and SI seconds were equal to 1 part in 109 and, from Morrison's (1979 a) ET(lunar) scale, the ET(ILE) and SI seconds were equal to 1 part in 1010. The long term fluctuation in the Earth's rotation has been parabolic, instead of sinusoidal, for at least 350 y.

Type
VII. Other Topics
Information
Symposium - International Astronomical Union , Volume 128: Earth's Rotation and Reference Frames for Geodesy and Geodynamics , 1988 , pp. 413 - 418
Copyright
Copyright © Reidel 1988 

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