STSONOMY.

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all Parts of the Earth. e 'equally enlightened from Pole to

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the A*f J ■ an< * have therefore a shorter Passage throughof ^ ^sphere. Thus, for Instance, in the Parallellet the Rays i E, kg, be incident on the1 g y ^Pnere mnm h and / ; then will their Passage h E,

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k ^thw T ter ^ an lt: would, be in the sarrife Latitude“htijpj 3 ™ 3 ’ an d therefore will not be so much refracted,"'ill {j e ’ ^ n d abforb’d ; and consequently their Effectb e mQ r m ° rc considerable and sensible. Again, as Rays^° r ce. 6 Perpendicular, they will strike with a greaterQt h tyk- s° *he more will fall on a given Space ; oh5(l d fj lc h Accounts their Effect, in respect of Light9, .^ at> Will be greater.

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-Parallel in the enlighten’d than in the dark| 5 or, in other Words, the Day will be

■*'« Jy lan the Night. Thus in the Northern TropicI s ies s a tNal Arch is RY, the Nocturnal Y T, which

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j V ^y pj e9Wl ^j As the Earth revolves about its Axis,lest nc:*l ee .j n North Latitude’will describe a greater

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the p asl the other by the Difference Y O. Again,a ara siel of Londdn the Length of Day is shewnth ^ of the Night by ZD, which is shorter

c de p' ( ‘‘ c Day by the Difference G Z. And lastly, ats ^lel . a . r ,Circle c b a it is all Day, no Part of that Pa-JhicR a' n ^ Within the dark Hemisphere a JE f. -On- Ur, jj\ Cc ount it is evident the Light and Heat of thea an V §re v er ln 2n y Pldce'of North Latitude now thanT ^idft Cr Cime of the Year. It is therefore nowthe Summer Season in all the Northern

t° r thx ^ the Southern Part of the World it is Winter,tk A sals 016 Reaso '« reversed,' viz. because-the Sun’sA° u kh 111016 obliquely thtrePj they therefore passs c ° a nt a | reater Quantity of the Attnosphere, on whichrN thp; r RA are more refracted, blunted, and stifled,b effect weaken’d. Also a less Quantity Of the’ r *ke Will fall on a given Space, and each Rayh a l e f s Rorce, and lastly, the Duration ofN 3 ' ' " theit

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