Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 257
yattain their greatest elongation, however, they becomestationary in the heavens; but their recess from the sunis still maintained by the advance of that luminary alongthe ecliptic, which continues to leave them behind, until,having reversed their motion, and become again direct,they acquire… … (399.) Suppose P Q to be the ecliptic, and ABD theorbit of one of these planets, (for instance, Mercury,)seen almost edgewise by an eye situated very nearly inits plane; S, the sun, its center; and A, B, D, S suc-cessive positions of the planet, of which B and S are inthe nodes. If, then, the sun S…
Astronomy
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