f «319 ) 
endeavour to make a Sirftem to (itisfy all Phanofkend^ nponi 
that Scheme. This in his propolition of the Aftronomy im 
Venus, he fays may be affedted from the true Syllem two 
ways : Firft, if Venm V7txt brought from its place in the 
trueSyftem down to the Genter, and the Sun and the reft 
of the Planets together with their Orbits, advanced as far 
the Gme way in parallel Lines, Such a Syftem mV^nus 
would be ^"^tltOiXy Tychonkk, in which the Sun wouldl 
be made turn round Venus in an Orbit equal, and like 
to -that, in which Fe^?// does Jreally turn round the Sun,, 
in the true Syftem, and all the Planets, together with their 
Satellites, befides tfadr being. carried iQwnHi Vmus by rhe Surr, 
would ha%'e all the fame motions round the Sun, as in the 
true Syftem. The Orbit of the Earth in this Syftem, v^ould 
cut the Sphere of the Smi alter the fame manner, as in the 
Mars interfeds the Orbit of the Sun in the Tychonuk Syftem, 
which is framed tor our Earth, whereas the Orbit 'jwfiur 
would not cut it, but furround it. The fecond way, by 
whichdan Aftronomer m Venum may contrive a Syfteni to fa* 
tisfy appearances, and make himelf unmntovabie in the Cen-- 
ter, is ' by bringing Vems to the Center, and advancing th 
Sun and all the Planets juft as far in parallel Lines, as wa 
done before ^ but leaving their Oibits imrnoveable, and th 
very (ame which the Plaaets defcribed round rhe Sun in th 
true SyftcmJf this were fuppofed bv an Aftionomer inVemis- 
it wouid be. the P^<?/e^/4/V4 Syftem, in which the Sun is carri 
ed round Venus^ placed in the Cent r of all the Planets Or- 
bii< and fuchof the Planets move in ati Epicicle fimularand . 
eqs.'al, but in a ccnaary polition to ihe irue Orbit of fe/^i» 
re siidvhe Sun., the Centers of the Epiciclts being moved in 
their dLicreiiiS in ihe ftme times that rhi. Planets themftlves 
perform th.:ir ievolurrou;) in the true Syrlcin And a Ftalemaick 
Syrtem made la rhio manner, v.oid-^ fansfyal! the Caleftial 
Phenomend- ti.p'}\\y~PiS well as ^hj^iycLwnkk or the true Syftem^ 
fl) that if tue l^tolej^^/^ick, Sy'>em loi" the Earth had b: n thus 
fraiiicd^ th^re could ,iiave been no arguuicnis ir<--m ob- 
