Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 103
pole, the reading will change by the angular distancebetween the nadir and the pole, or by 90° -f- </>, 0 beingthe latitude of the place (supposed to be known). Thepolar reading P is thus known when the nadir readingJVis found. If the telescope is then pointed to variousstars of unknown polar… … Pig. 35.—the meridian circle. THE MERIDIAN CIRCLE. 85 To determine the readings P, JF, P, etc., we use the micro-scopes R, i?, etc. The observer, after having set the telescope sothat one of the stars shall cross the field of view exactly at its cen-tre (which may be here marked by a single…
Astronomy
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