A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 73
of the parallax is, that it varies as the sine of the zenith dis-tance directly, and inversely as the linear distance (in miles) of the body.This follows easily from the triangle COP, where we havePC:OC = sin COP: sin CPO. Put D for PC, the distance of the body from the earth; R forthe earths… … Diurnal Parallax. This gives us D : E = sin £ : sin p.sin p = — siu£ ; or, since p is always a small angle, n ?> = 206265 ■ sin£.1 D PARALLAX. 61 83. Horizontal Parallax. — When a body is at the horizon (Ph inthe figure), then £ becomes 90°, and sin £ =1. In this case the par-allax reaches its…
Astronomy
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