Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · Cambridge, University press · leaf 417
402' PROBLEMS INVOLVING SUN OR MOON [CH. XIX on the terrestrial equator, and A the arc of the moon's equator from its ascending node on the earth's equator to its ascending node on the ecliptic. S is as usual the longitude of the ascending node of the moon's orbit on the ecliptic. … Fig. 100. T (Fig. 100) is the vernal equinox, N is the ascending node of the moon's orbit on the ecliptic TiV and therefore by Law 3 the descending node of the moon's equator HN, and as A is measured from H to the ascending node we have iriV"= A -180°. In this spherical triangle to and I have the…
Spherical astronomy
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