l6g

k

of

Astronomy.

^ ! '° ns °f Æe Moon: As, the Variety° n s, the Vicissitudes and various

Lengths

j^l’d ®°dies separately, which they accordingly

Ahred Anet ariums, Lunariums, & c . and othersM S Orreries in general, as giving false

hC S y ste m of the World, especially as thet' 0t he r? eS 3Uci Dances of the Heavenly Bodies couldV Presented by them in their proper Propor-

lz. g

°bjeA t ^ le y mu ft he supposed to reason very weakly,^r>t, ao \ at r inconsiderable Deficiency in any Instru-iii| Cr ' e( s most important Uses. No one ever

,"'.r Pump, because an absolute Vacuum was0 >ot s ee °r the Use of a Telescope, because we

•n haty] ^ n h ;l hitants os the Planets. And on thet0 - ^present the Solar System by Parts, or

vjj , --["''icut tiiv- uuicti uyiitin uy a «L1 kd, 01

^hk 'iiorr' 16 ' 1 * banner, is little less than mangling onesots' T, nohle an d uniform Parts of Natural Philo-^‘r s j- le Planetarian Scheme therefore of Dr. Dc-

is t H‘ Ann became oxtindf.

Only then, adapted to an Armillary Sphere,

M.^yftem '^ ac ^rne that can exhibit a just Idea of thet^ons 0 f os the World, with the diurnal and annualthis* 1 • heavenly Bodies ; and none but an Or-can ho that: Yea furthermore, such'a rt h, b Ca P a ^^ e os exhibiting the third Motion of\ , °tio n ^ means °f the Armillary Sphere ; I meanhd re v . os the Earth by which the Poles of the%e^ s "'hat^ 6 a ^ out ^e Poles of the Ecliptic, and oc-lyA Or jv. lS Commonly called the PreceJJion of the Equi-^s, ore properly the Retrogression of the Earth’s

*1 as !^ 0 tiol th f e Rea her may have a proper Idea of thiski t r?ho\v s r e Earth and its Axis, I shall explainhs p" Eet D C H be a Part of the Earth’s Or-fhejl p P th^^L^' ^ ^ the Axis of the Ecliptic, E itsItu Phit s p e j ls os the Earth, P its Pole, through^Eclipj^ ^ ^ raw the great Circle EPA, meet-lc A L in A ; the Arch PA measures the

Inclination

Plate .LXIV.Fig. i.