Berry, Arthur,b. 1862 · London, J. Murray · leaf 42
n tell us about the position of such an object as a staris its direction; its distance can only be ascertained byindirect methods, if at all. If we draw a sphere, andsuppose the observers eye placed at its centre o (fig. i),and then draw a straight line from o to a star s, meetingthe surface of the… … *P Fig. i.—The celestial sphere line. When we speak, therefore, of a star as being ata point s on the celestial sphere, all that we mean is thatit is in the same direction as the point s, or, in otherwords, that it is situated somewhere on the straight linethrough o and S. The advantages of this…
Astronomy
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