A popular handbook and atlas of astronomy, designed as a complete guide to a knowledge of the heavenly bodies and as an aid to those possessing telescopes (1891)
Peck, William, Sir, 1862-1925 · New York, G. P. Putnam's Sons · leaf 182
noting the surrounding stars, easily identified. As it is often desirable to ascertain the time of sunrise and sunset, and the approximate duration oftwilight, in order to know w^hen the faintest stars can be seen, the Tables inserted on pages 120 and 121have been constructed. By means of these… … ■o liours jn UjoJ EXPLANATION OF TEE STAB CHARTS, ETC. 117 and in the column indicated by the particular latitude of the place of observation, the hours andminutes of semi-diurnal arc will be found. This is equal to the apparent time of sunset, or of sunrise ifsubtracted from twelve hours. To find…
Astronomy
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