Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 67
. In this consists its advantage.Latitude by a Single Altitude of a Star.—In the triangleZTS (Fig. 14) the sides are ZP = 90° — 0; P 8 = 90° — <*; Z8 —Z= 90° — «; ZPS — h = the hour-angle. If we can measure atany known sidereal time 8 the altitude a of the star 8, and if wefurther know the right… … Fib. 17. sin a = sin a and S are known, and h = 6 — a, so that Put d sin D = sin 6 (2) d cos D = cos 6 cos A, (3) whence d and D are known, and (1) becomes d cos (0 — D) = sin «, (4) whence 0 — D and 0 are known. The altitude a is usually measuredwith a sextant. Latitude by a Meridian Altitude.—If…
Astronomy
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