Some Advantages and Disadvantages of a Photographic Zenith Tube

  • Dennis D. McCarthy
Chapter
Part of the International Astronomical Union book series (IAUS, volume 82)

Abstract

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 ±0 . ″ 03 in latitude and ±0 . S 003 in time, determined from the internal error of one sight. Accuracies estimated from the external error of a sight were found to be ±0 . ″ .08 in latitude and ±0 . S 006 in time.

Keywords

Proper Motion Polar Motion Daily Operation Star Catalog Internal Error 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

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

Copyright information

© IAU 1979

Authors and Affiliations

  • Dennis D. McCarthy
    • 1
  1. 1.U. S. Naval ObservatoryUSA

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