... equator and the ecliptic, and hence, also, the position of the equinoxes. In expressing the positions of stars, referred to the vernal equinox, at any given instant, the actual position of the equinox at the instant is understood, unless otherwise...
An Elementary Treatise on Plane & Spherical Trigonometry: With Their ... - Page 199
by Benjamin Peirce - 1845 - 449 pages
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