Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 64
ur angle at which it rises or sets ; or beingchanged to time by dividing by 15, it will be the interval of siderealtime between its rising and its passage over the meridian, or be-tween this passage and its setting. This interval is called the semi-diurnal arc, and by doubling itwe have the time… … and the arc during which thestar is above the horizon is 2 h.From this formula may bededuced at once many of theresults given in the preceding -c, 1pr ■, o^f,*™* FlG. 15.—UPPER AND LOWER DITJR- secLions. VAT a-una (1). At the poles <p = 90% ^ N L RCS tan <p = infinity, and therefore cos h =…
Astronomy
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