A S T R 6 N O M Y.

At the same Time the Earth isround the Sun, the Moon is seen costst arl

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circulating round the Earth once inDays and a half; whidf Days are ^ber’d on a silver’d Circle* and fheWfl ^an Index moving over them. Thus j sDay of the Moon’s Age, arid the ^^proper thereto, are shewn for any reC r f

Time ; and also why we see always on ethe fame Face of the Moon\ viz. on A c _ c<of her turning about her own Axis trifame L Time Jhe takes to revolve abo$Earth.

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Again : By placing a Lamp in th ^tery, and making the Room dark, ^ j^yvery naturally how the Sun is ecltyf ^the New Moon, and the Shadow P^^fover the Diik of the Earth ; and all" 0 ^the Moon, at Full, is eclipsed by P^fthrough the Shadow of the Earth. ^also we see the Manner how Mercurf ^ $Venus transit the Sun’s Face in Form ^dark roimd Spot ; and also why the/ ^never appear at a great Distance fr 01 ^. fSun; and various other Phœnomena , 0like Nature (CXLIII). fU*

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(CXLIII) j. The Doctrine of Eclipse 5 j*be explained. The Sun being a luminous Bo flarger than the Earth, will enlighten Ibnie^ •