A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 370
period of the planet, then, begin-ning at the time of opposition,it will be found that as theplanet recedes from the earth,the eclipses fall constantly moreand more behindhand, and byprecisely the same amount forall four of the satellites. Thedifference between the tabulatedand observed time… … Fig. 181.Determination of the Equation of Light. After the conjunction, the eclipses quicken their pace and exactlymake up all the loss ; so that when opposition is reached once more,they are again on time. It is easy to see from Fig. 181 that at opposition the planet isnearer the earth than at…
Astronomy
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