Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 74
be found by direct observation,but when we know the obliquity of the ecliptic, togetherwith the right ascension and declination of a body, we cancompute its latitude and longitude, THE SOLAR SYSTEM. 69 Explanation. V is the vernal equinox;VR an arc of the equinoctial; VD an arc ofthe ecliptic; P… … Fig. 28. When we know QV and QP in theright-angled triangle VQP, we can find, by the principles of trigonom-etry, the angle QVP and the arc VP. In the right-angled triangleVPC the angle CVP is equal to the difference between QVP and theobliquity RVD, and consequently we cau find CP and VC, the…
Astronomy
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