Abstract
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.
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References
Miyamoto, M. and Ishii, H.: 1982, Publ. Astron. Soc. Japan, 34, 117.
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© 1986 International Astronomical Union
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Miyamoto, M., Yoshizawa, M. (1986). A New Method for Zenith Distance Determination in Meridian Observations. In: Eichhorn, H.K., Leacock, R.J. (eds) Astrometric Techniques. International Astronomical Union / Union Astronomique Internationale, vol 109. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4676-7_70
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DOI: https://doi.org/10.1007/978-94-009-4676-7_70
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-277-2257-7
Online ISBN: 978-94-009-4676-7
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