38q

'The Use of the Globes*

I. The Latitude of any P^ ce ^grDistance from the Equator toward 8 j e -

iW

PlateLXVI.?>§• 3-'

Western Horizon; but when the otherthere, t R will be the Position of the Ecliptic-. ^ a tTVernal Equinox if a Full Moon happens, >tin the Eastern Horizon at Rising ; in one Day , jjwill describe the Arch Gc; wherefore th® , 0 ’Cl°? eNight so much Time will intervene between b 15 ^ ^ tn

and the Hour of the Moon’s rising, as is p? eMotion of the Globe while the Arch C c I s 3 ‘above the Horizon. VeaO

11. Whereas at the opposite Time of the tat the Autumnal Equinox, if a Full-Moon happ

the next Night the Moon’s diurnal Arch to b e p 0 (iti^above the Horizon is C b — C c; but since the ■ q (} 1of C b is so much nearer to the Horizon B ia £ ol itwill ascend much sooner above it, viz. < n afifth Part of that Time, and sometimes in 1 • r stuSthe Moon’s Orbit sometimes makes a » l j 2 g-met* 1 ' 1 !with the Horizon than TCHruCr, an “a less Angle than r C H - « C b. But for *»° rSubject fee my Philosophical Grammar. . pec^l

12 . Because in many Cases it is absolute jh^

to have a Meridian-Line at hand, I shall aw

• - t a one 01 - -,t

the best Way of making or drawing such a^‘ a str^

jht > n >

Plane where the Sun can shine, thus.

Brass-Pin or Steel Wire A B be fixed u P rl S J bd°[Point A, on which, Point as a Centre you j- Q Ftdescribed several concentric Circles, as C D&c. Now to make the Pin A B exactly a 5

let three Points be chosen in the outmost '-' ll n’ eS , ifG, H, in which place one Foot of the Comp f 1extend the other to the Top of the Pin B- ^ po 1 ’’,is to be bent one way and the other, dlDjj® • ot ^iof the Compasses will fall nicely on the M> • a>'

Top B from each Point of the Circle F, 5then is the Pin well adjusted. t fre ’f??

13. Then observing in the Forenoon w ° er f ese ,iU ,

yf the Shadow A C touches any one Circle, t ^ jyjistk $