Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 174
the terrestrial equator does to the earth —the former holding an invariable position with respectto the stars, as the latter does with respect to stationson the earths surface. The force of this observationwill presently become apparent. (260.) Knowing the right ascension and declinationof an… … 31 4? A TREATISE ON ASTRONOMY. CHAP. IV. course 90° distant from V, the vernal equinox, whichis one of its poles — so that V R (the right ascension)being given, and also V E, the arc E R, and its measure,the spherical angle E P R, or K P X, is known. Inthe spherical triangle K P X, then, we have…
Astronomy
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