Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 354
by 15, (Art. 91,) to obtain the time,we have 5h. 6m. 12s. for the time of sunrise. Subtractingthis time from 12 hours gives 6h. 53m. 47.6s. for the timefrom sunrise to noon, and also the time of sunset. Prob. 2. What is the length of the day at Yorktown, Va.,N. Lat. 37° 13. when the declination of… … In figure 3, let S be the star, P the pole of the heavens,Z the zenith of the place, and QL the equator—PZH is ameridian, PSE an hour circle, and ZSD a vertical circle.As the star is six hours from the meridian, ZPS is a rightangle, and the circle PSE cuts the horizon in the east andwest points;…
Astronomy
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