A compendium of spherical astronomy with its applications to the determination and reduction of positions of the fixed stars (1906)
Newcomb, Simon, 1835-1909 · New York, The Macmillan company; London, Macmillan and co., ltd. · leaf 292
e by apair of circles as shown in Figure 33. § 144.] APPROXIMATION NEAR THE POLE 271 The length of the semi-axis a may be taken as 1° for every10 years of the interval through which the reduction extends.The limits are, in general, given by the equationPolar Distance = 0°-lOt cos a.The argument of… … Fig. 33. other. It is shown by the two dotted circles. If, owing to theposition of the star being within the limits just defined, or to anyother reason, the rigorous formulae (17) are used, the computationcan still be facilitated by using the table for K. 144. Beductiou of the proper motion. The…
Spherical astronomy · Stars
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