Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 30
telescope turn together, thereading of the circle will always be the same when the tele-scope has the same direction. The reading when the tele-scope is directed toward the pole of the heavens, and whichwe may call the polar reading, can be found as follows :direct the line of collimation to a star… … Fig. 9. The meridian circle. 26 ASTRONOMY. of its lower culmination, and take the reading of the circle;the half sum of these readings (after both are corrected foratmospheric refraction) will be the polar reading. If we subtract 90° from the polar reading we have whatmay be called the equinoctial…
Astronomy
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