Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 155
ht ascension in hours. The sky has an apparent motionwestward because of the earths actual rotation eastward,and it makes a complete circuit of 360° in 24 hours. There-fore it apparently moves westward 15° in one hour. Itfollows that a simple method of finding the right ascensionof an object is to… … CH. IV, 68] REFERENCE POINTS AND LINES 127 67. The Ecliptic System. *— The third system which isemployed in astronomy, but much less frequently than theother two, is known as the ecUptic system because the funda-mental circle in its first set is the ecliptic. The ecliptic isthe great circle on the…
Astronomy
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