Stars and telescopes; a hand-book of popular astronomy, founded on the 9th ed. of Lynn's Celestial motions (1899)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911. Celestial motions · Boston, Little, Brown and company · leaf 51
d theSun. For what makesthe observance of theyear necessary to us isthe change produced bythe variations in the sea-sons ; and in conse-quence of a slow conicalmovement of the Earthsaxis (occupying about25,800 years to com-plete a whole round, andcalled precession of the equinoxes, from the effect… … POSITION OF THE VERNAL EQUINOXB. C 2170
Astronomy
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