Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 258
ion of the circulationbeing the same in both, viz.that of the arrow. ^Hien theplanet stands at a, let theearth be situated at A, in thedirection of a tangent, a A, toits orbit; then it is evidentthat it will appear at its greatestelongation from the sun, — theangle a A S, which measurestheir… … 252 A TREATISE ON ASTRONOMY. CHAP. VIII. taining, at least approximately, the distance of theplanet from the sun, or the radius of its orbit, supposeda circle. For the triangle S A a is right-angled at a,and consequently we have S & : S A : : sin. S A a :radius, by which proportion the radii S…
Astronomy
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