Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 158
tar crossesthe meridian at an altitude of 60°, he knows that it is 10°north of the celestial equator, or that its declination is 10°;and by noting the time that has elapsed from the time ofthe passage of the vernal equinox across the meridian to thepassage of the star, he has its right ascension.… … Fig. 48. Fig. 49. Equator and ecliptic. date and time of day. Then the pole of the echptic XVXAis at R and the ecliptic crosses the meridian below theequator. In this case the star might have north celestiallatitude and be on the meridian south of the equator. Twelvehours later the vernal equinox…
Astronomy
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