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A New Method for Zenith Distance Determination in Meridian Observations

Published online by Cambridge University Press:  04 August 2017

M. Miyamoto  and
M. Yoshizawa
M. Miyamoto
Affiliation:
Tokyo Astronomical Observatory, Mitaka, Tokyo 181, Japan
M. Yoshizawa
Affiliation:
Tokyo Astronomical Observatory, Mitaka, Tokyo 181, Japan

Extract

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In meridian observations, the main error sources of the declination observation reside in determination of the atmospheric refraction, the flexure of the telescope and the division errors of the graduated circle. In order to obtain higher accuracy in the declination observation, besides a full automation device, the photoelectric meridian circle at Tokyo Astronomical Observatory (Tokyo PMC) is equipped with photoelectric devices for circle reading and a zenith mirror in addition to the conventional mercury horizon. We report here on a preliminary determination of the horizontal and vertical flexures, and of the division errors of the glass circle.

Type
VI. Transit Circles and Astrolabes
Information
Symposium - International Astronomical Union , Volume 109: Astrometric Techniques , 1986 , pp. 557 - 565
Copyright
Copyright © Reidel 1986 

References

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Miyamoto, M. and Suzuki, S.: 1985, Ann. Tokyo Astron. Obs. 2nd Ser., 20, to be published.Google Scholar
Podobed, V. V.: 1965, Fundamental Astrometry, translated by Vyssotsky, A. N. (The University of Chicago Press, Chicago).Google Scholar