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Some Advantages and Disadvantages of a Photographic Zenith Tube
Published online by Cambridge University Press: 14 August 2015
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 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
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