274 POPULAR SCIENCE REVIEW. of catalogues, or for special purposes. Certain instrumental errors, such as flexure of the telescope, errors of circle divisions, and want of circularity of pivots, are determined occasionally. Nothing is supposed for a moment to he in perfect adjustment; Fig. 3. … THE ALTAZIMUTH. no^error is mechanically corrected ; everything is supposed to be always wrong, and to be corrected numerically in the after reduction of the observations. ^But the Transit Circle has an important auxiliary in the Altitude and Azimuth, or, as it is briefly called, the Altazimuth…
Astronomy · Greenwich Observatory · Longitude
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