Abstract
The center of each western and eastern pillar head of the Tokyo PMC accommodates an axis collimator. Each axis collimator has a target of multi-slits system and two photodiode arrays to read the position of an autocollimated image of the target. In all celestial observations and measurements of instrumental constants, regular and irregular changes of the direction of the rotation axis of the Tokyo PMC are measured in real time with the axis collimators. The accuracy of the measurements is about 0.″02 under 30 sec integration. The measured real-time changes are used to evaluate instantaneous level and azimuth of the instrument as a function of both time and zenith distance. The present scheme of real-time correction of the pivot irregularities was applied in the compilation of the Tokyo PMC Catalog 85.
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