Setting of a Celestial Body

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Setting of a Celestial Body

 

an astronomical phenomenon caused by the diurnal rotation of the earth on its axis; the moment when a celestial body crosses the hozizon in its transit to the invisible half of the celestial sphere below the horizon. The moments of the setting of a celestial body and the azimuth of the point of setting are determined by the same formulas as for the rising, but of the two values of t and A, 0° < t < 180° and 180° <A < 360° are selected.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.