Tianjin photographic zenith tube observations

Details Tianjin photographic zenith tube observations Tianjin photographic zenith tube observations

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984cha%26a...8..328j&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 8, Issue 4, p. 328-334.

Astronomy and Astrophysics

Astrophysics

Scientific paper

In this paper we analyse the observational data obtained by the Chinese-made PZT in the two periods 1979 Feb - 1980 May and 1981 Dec - 1983 March. The internal accuracy of single star is found to be mu = +/-13.0 ms, mφ = +/-0. ``144 for the first period, and mu = +/-14.6 ms, mφ = +/-0.'' 152 for the second. Correction of star position is found by the chain method. The systematic error caused by the sealed window of the evacuated chamber and the temperature effect of the plate scale are investigated. Monthly means of time and latitude are given.

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