The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J. (Charles Joyce), 1839-1917 · New York, J. Wiley & sons; · leaf 118
ecliptic remains stationary in the heavens (or at leastso nearly stationary that the latitudes of the stars only varyby half a second of arc in a year), this precession must be con-sidered to be a motion of the equinoctial on the ecliptic. In Fig. 46, let EQ represent the equinoctial, and ZOthe… … taiued by considering P, the pole ofthe equinoctial, to revolve about A,the pole of the ecliptic, in the circlePG (the polar radius of which, AP,is 23° 27), moving westward in thiscircle with the annual rate of 50.2,and completing its revolution in25,817 years. A general explanation of thecause of…
Astronomy
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