The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J. (Charles Joyce), 1839-1917 · New York, J. Wiley & sons; · leaf 109
4 be a proj action of the celestial sphere on the plane of the horizon. Z is the zenith, P the pole, EVQ the equinoctial, CL the ecliptic, and Fthe vernal equinox. Let T be the position of the true sun in the ecliptic, and M that of second mean sun in the equinoctial. The angle TPM is evidently the… … 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 therirst mean sun, or, as it is…
Astronomy
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