Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 189
tudeof this point on the ecliptic itself from the equinox.These, and all questions referable to the same data andqua?sita, are resolved by the spherical triangle Z P E,formed by the zenith Z (considered as the pole of thehorizon), the pole of the equinoctial P, and the pole ofthe ecliptic E. The… … CHAP. IV. VR AKOGR APHICAL PKOBLE31S. 1S3 given P Z, the co-latitude ; P E, the polar distance cfthe pole of the ecliptic, 23° 28, and the angle Z P E ;from which we may find, 1st, the side ZE, which iseasily seen to he equal to the altitude of the nonagesimalpoint sought; and, 2dly, the angle P Z…
Astronomy
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