The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 61
. 54. Geocentric Parallax.—In Fig.21, let Cbe the centre of the earth,and L some point on its surface, of which Z is the zenith. LetS be some celestial body. The geocentric parallax of the bodyis the angle CSL. Let S be the same body in the horizon.The angle LS C is the parallax of the body for… … Fig. 21. sin P = d To find the parallax for any other position, as at S, we repre-sent the angle LSC by p, and the apparent zenith distanceof the body, or the angle ZLS, by z, the sine of which is equalto the sine of its supplement SLC. We have from the tri-angle LSC, since the sides of a plane…
Astronomy
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