ijS Astronomy.

Day ; and that Part in the darkwill be the NoSlurnal Arch , orthe Night , in that Parallel of Latitude- _ ^Hence, when the Orrery is P ut LjsMotion, the Earth moving with its Jalways parallel to itself, yet always iflC . ' §to the Diane of the Ecliptic , will soiU etI ^,jyhave the Northern Parts turned more d^ yto the Sun, and most enlightened; fi,other Times the Southern Parts willHence various Alterations of Heat artd uand Length of Days and Nights , wiu ^in the Course of the Revolution ot fi,Earth about the Sun, which willtute all the Variety of Seasons , as wi^ fitnaturally and evidently be strewn lilOrrery, as follows (CXLII).

Pltaa

LVIII.

'a t0

{CXLII) i. Though these Things are ^Person who has his Eye on an Orrery, whileor reads this Account of|he Nature and Ma * 1 ® 1 rje^ $Seasons, and the Variety'of Day and Night, y ethis Sort are not so easy to be obtained by ^ piand Cogitation only, unless assisted by a P^gll ^gram or Representation'; which therefore I ^

subjoin and explain.

2. Let S be the Sun, A B C D the Orbit J* Q! ^annual Path of the Earth about the Sun. I j 1 41 ji> ^jjthe Earth is represented in four several Positi 0 ** ’ Vmidst of the four Seasons respectively. On ^are drawn the several Circles and Lines asÆCQ_ The Equator.

TOR The Tropic of Cancer. .c

P M L The Tropic of Capricorn.