Astronomy. *79

first give the Earth Motion ine first Point of Libra 5 the Sun will then

appear

j^ c The North Polar or Arctic Circle,j,,®^ The South Polar or Antarctic Circle,

hr o 0 The Parallel of London.s k The Earth’s Axis.

7 > f The Axis of the Ecliptic Plane. _ ;

V’ a the Sun is supposed to be at so great a Distance,

6 ®' a y s coming from it do arrive at the Earthtjthey will therefore illuminate very nearly\ fif of the Globe of the Earth, abstracting fromhey fiction of the Air. And if we are supposed toe ^rth circulating about the Sun at a very great, c , e in the Positions represented in the Scheme,tL lfi ave all the enlightened Part turn’d to the Eyel h ( l u ' Ul °ctial Day in the Spring, but on that in.

H ^ we see only the dark Partas on the Sum-k i» sinter Solstices we fee only half the light and ,kh; ^stpheres respectively : And accordingly the. 4. ft, ^ Us represented in the Figure.

Vy Ut I find by Experience} the best Way tokir* Idea of the Seasons, and Day and Night isthe Earth also in Positions exhibiting thek p He misphere equally divided into the light andS or semicircular Areas, as in themext Plate; Plateu W° m P are these both together in the Description. FIX.li e c 8>n therefore with the Situation of the Earth in5- 1,!°? an d Autumn'. ,

% Pi n Other of these Cafes, *tis evident the Sun is inikt f of the Equator Æ LL, and therefore equallyK/, Jom each Pole of the World ; consequently the1 S . Rumination will pass trough both the Poles, Fig. 2^

^d therefore every Place at an equal Distancekht r s }de will have an equal Degree of the Sun’sIT'S, , d Heat. And as the Earth revolves upon itsnktQr ^ ^*Hce must describe a Circle parallel to thenN-ts,V 0lVe Half of which will be in the light, theVlr cl e 'N the dark Hemisphere ; and as Parts of the

ie asore the Day and Night, it is plain they mult j

N 2 thest