Influence of changes in azimuth of a transit instrument on the determination of absolute right ascensions by the zenith symmetry method

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Astronomical Coordinates, Azimuth, Instrument Orientation, Stellar Motions, Visual Observation, Instrument Errors, Linear Equations, Zenith

Scientific paper

The equation derived in the present paper for processing measurement data obtained for individual pairs of stars symmetrical with respect to the zenith contains a term defined by fluctuations of the azimuth of the transit instrument when it is switched from one star to the other. This term also appears in the solution of a system of linear equations which relate the measurements for the individual stars of a pair. The influence of this term is insignificant at zenith angles smaller than 5 degrees, but is quite noticeable at large zenith angles. The behavior of this term is studied as a function of the zenith distance of a pair of stars and the latitude for zenith distances ranging from 0 to 30 degrees.

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