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Some Advantages and Disadvantages of a Photographic Zenith Tube

Published online by Cambridge University Press:  14 August 2015

Dennis D. McCarthy
Dennis D. McCarthy*
Affiliation:
U. S. Naval Observatory, Washington, D. C. 20390 USA

Abstract

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The theory and instrumentation of a photographic zenith tube (PZT) have been described by various authors (Torao, 1959; Markowitz, 1960; Thomas, 1964; Schuler, 1968; Takagi, 1974). Analysis of the more recent results of the PZT's of the U. S. Naval Observatory at Washington, D. C. and Richmond, Florida, permit the determination of precision and accuracy estimates which may be expected from the daily operation of a PZT. This analysis shows precisions of in latitude and in time, determined from the internal error of one sight. Accuracies estimated from the external error of a sight were found to be in latitude and in time.

Type
Part I: Time
Information
Symposium - International Astronomical Union , Volume 82: Time and the Earth's Rotation , 1979 , pp. 65 - 66
Copyright
Copyright © Reidel 1979 

References

Markowitz, Wm.: 1960, “Stars and Stellar Systems”, vol. 1, p. 88.Google Scholar
Schuler, W.: 1977, “Etude Theorique et Experimental de la Lunette Zenithale Photographique (PZT) de Neuchatel”, Edition Medicine & Hygiene, Geneva.Google Scholar
Takagi, S.: 1974, Pub. Int. Latitude Obs. of Mizusawa 9, p. 259.Google Scholar
Thomas, D. V.: 1964, Royal Obs. Bulletins No. 81.Google Scholar
Torao, M.: 1959, Ann. Tokyo Astron. Obs. Second Series 6, p. 103.Google Scholar