Determination of new screw value and discussion about run error for the micrometer of zenith telescope in Tianjin latitude station.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Latitude Determination: Micrometers, Errors: Micrometers

Scientific paper

In the end of 1992, the micrometer of the Zenith Telescope (ZTL-180) in Tianjin Latitude Station of Beijing Astronomical Observatory was changed for a new micrometer screw. According to the 139 observations of elongation of circumpolar star times during Dec 28, 1992 to Aug 17, 1993, the screw value is calculated. The analysis of observational data indicates that the maximum error, within the average screw value three circles for different positions of the screw is about 0μ8 which is better than the conditions requested to the manufacturer.

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