Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 33
cle will then be the number of thefirst division on the circle behind the o of the vernier, anda number of tenths equal to the number of the division ofthe vernier, which coincides with a division of the circle.For instance, suppose o of the vernier beyond 6 of the i6 ASTRONOMY. circle, and 7 of… … pass through the poles ofthe heavens, as shown inFig. 18. E Q is the celes-tial equator, and P andPr are the poles of theheavens. The point A on theequinoctial (Fig. 19) iscalled the vernal equinox,or the first point of Aries.The hour circle, A P P\which passes through it, is called the equinoctial…
Astronomy
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