Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 62
e ofthe body, or the angle ZLS, by z, the sine of which is equalto the sine of its supplement SL G. We have from the tri-angle LSG, since the sides of a plane triangle are proportionalto the sines of their opposite angles, sin p __ R9 sin z ~~ d Combining this equation with the preceding, we have,… … 56 PARALLAX. distance, and may be found for any altitnae when the hori-zontal parallax is known. It evidently decreases as the alti-tude increases, and in the zenith becomes zero. 55. Application of Parallax.—In order that observationsmade at different points of the earths surface may be com-pared,…
Astronomy
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