The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 110
n of time. Let Fig. 44 be a projection of thecelestial sphere on the plane of thehorizon. Z is the zenith, P thepole, EVQ the equinoctial, CL theecliptic, and Fthe vernal equinox.Let T be the position of the truesun in the ecliptic, and M that ofsecond mean sun in the equinoctial.The angle TPM is… … CALENDAR. 105 second mean sun in the equinoctial is, by hypothesis, as shownin the previous article, equal to the angular advance of the firstmean sun in the ecliptic, it follows that the right ascension ofthe second mean sun is always equal to the longitude of thefirst mean sun, or, as it is…
Astronomy
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