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The Role of Occultations in the Improvement of the Lunar Ephemeris

Published online by Cambridge University Press:  07 February 2017

L. V. Morrison
L. V. Morrison*
Affiliation:
Royal Greenwich Observatory, England

Abstract

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Analyses of occultation timings show that periodic correction terms with semi-amplitude as great as 0.″18 arise from corrections required to the empirical constants of the Brown/Eckert theory. Using the atomic time-scale, some of the occultation data have been used to determine a correction of – 30 ± 16″/cy2 to Spencer Jones' value for the secular acceleration of the Moon. In the light of this correction, and previous determinations, attention is drawn to the possible weakness of Spencer Jones' value, which is not reflected in his quoted error of ± 1″/cy2. Further analyses of 50000 occultations observed since 1943 promise to reveal more accurately-determined corrections.

Type
Part II: Scientific Papers
Information
Symposium - International Astronomical Union , Volume 47: The Moon , 1972 , pp. 395 - 401
Copyright
Copyright © Reidel 1972 

References

Clemence, G. M.: 1943, Astron. Pap. Amer. Eph. Naut. Al. XI, 53.Google Scholar
de Sitter, W.: 1927, Bull. Astron. Inst. Neth. 4, 21.Google Scholar
Fotheringham, J. K.: 1920, Monthly Notices Roy. Astron. Soc. 81, 104.Google Scholar
Garthwaite, K., Holdridge, D. B., and Mulholland, J. D.: 1970, Astron. J. 75, 1133.Google Scholar
IAU, Report of Commission 4, 1967. Trans. IAU 13B, 49.Google Scholar
Improved Lunar Ephemeris, 1954. Suppl. to Amer. Eph. Naut. Al., Washington D.C. Google Scholar
Innes, R. T.: 1925, Circular of Union Obs. South Africa, No. 65.Google Scholar
Morrison, L. V. and McBain Sadler, F. M.: 1969, Monthly Notices Roy. Astron. Soc. 144, 129.CrossRefGoogle Scholar
Morrison, L. V.: 1970, in de Jager, C. (ed.), Highlights of Astronomy, p. 589.Google Scholar
Newton, R. R.: 1970, Ancient Astronomical Observations and the Accelerations of the Earth and Moon, Johns Hopkins Press, London.Google Scholar
Robertson, J.: 1940, Astron. Pap., Wash. X, Part II.Google Scholar
Spencer Jones, H. Sir: 1939, Monthly Notices Roy. Astron. Soc. 99, 541.CrossRefGoogle Scholar
Stephenson, F. R.: 1971, .Google Scholar
Van Flandern, T. C.: 1970, Astron. J. 75, 657.Google Scholar
Van Flandern, T. C.: 1971, Astron. J. 76, 81.Google Scholar
Watts, C. B.: 1963, Astron. Pap., Wash. XVII.Google Scholar
Williams, K. P.: 1939, Indiana U. Publ., Science Series No. 9, with Suppl., 1940.Google Scholar