Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 23
rotation,produced indefinitely, would pierce the celestial sphere. Since the two poles are diametrically opposite in the sky, only oneof them is usually visible from any given place. Observers north ofthe earths equator see only the north pole, and vice versa for observ-ers in the southern… … 12 HOUR-CIRCLES. [§ 14 and is the great circle in which the plane of the earths equatorcuts the celestial sphere. It is often called the Equinoctial.Fig. 4 shows how the plane of the earths equator producedfar enough would mark out such a circle in the heavens. Small circles drawn parallelto the…
Astronomy
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