Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 131
the ecliptic, but at, say, the point JB, welet fall a perpendicular B J from the body upon theecliptic. The length of this perpendicular, measured indegrees, is called the latitude of the body, which may benorth or south, while the distance of the foot of the per-pendicular from the vernal equinox… … Fig. 47.—circles of the sphere. plane more nearly fixed than that of the equator. On theother hand, it is more convenient to represent the positionof all the heavenly bodies as seen from the earth by theirright ascensions and declinations, because we cannot meas-ure their longitudes and latitudes…
Astronomy
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