Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 75
allaxat any altitude is obtained, the horizontal parallax can be derived from it;the parallax varying as the sine of the zenith distances. For instance, thesine of MPZ : the parallax CMP : : the sine of ninety degrees : the zenithdistance of the moon on the horizon, i. e. her horizontal parallax.… … TRANSIT INSTRUMENT. Fig. 26, one horizontal and five vertical: the latter beingparallel to each other, and separated by equal intervals;1 FIG. 26.
Astronomy
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