Methods to correct the variable graduation error of the meridian circle

Details Methods to correct the variable graduation error of the meridian circle Methods to correct the variable graduation error of the meridian circle

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.177..251m&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 177, no. 1-2, March 1991, p. 251-257.

Astronomy and Astrophysics

Astrophysics

Astrometry, Celestial Bodies, Instrument Errors, Measuring Instruments, Accuracy, Annual Variations, Automatic Control, Calibrating, Diurnal Variations

Scientific paper

Using the fully automated graduated meridian circle of the Tokyo Observatory (the Tokyo PMC), it was possible to obtain coarse measurement of the first ten dominant Fourier components of the graduation error in the PMC in only 15 min, making it possible to monitor the annual and diurnal variations of the meridian circle graduation. These measurements can be used to correct daily observations for the annual variation in graduation error. This paper describes the method used to detect the dominant components of the graduation error and discusses the results of measurements.

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