been lately confirmed by the Emersion of the first Satellit observ'd at Paris , the 9th of November last, at 5 a-clock 35' 45" at Night, 10 Minutes later than it was to be expected, by deducting it from those that had been observ'd in the Month of August , when the Earth was much nearer to Jupiter ; which M. Romer had predicted to the said Academy from the beginning of September .
But to remove all doubt, that this Inequality is caused by the Retardment of the Light, he demonstrates, that it cannot come from any Excentricity, or other Cause of those that are commonly alledged to explicate the Irregularities of the Moon, and the other Planets; though he be well aware, that the first Satellit of Jupiter was Excentrick; and that, besides his Revolutions were advanced or retarded, according as Jupiter did approach to or recede from the Sun; as also, that the Revolutions of the Primum Mobile were unequal: Yet, saith he, these three last Causes of