( * 4 + ) 
u again (but the Sun, in the mean time. Teeming to be 
“ mov’d a Degree, according to the Series of the Signs, 
“ i 3 the Caufe why there are fourMinutes more requir’d 
before the Meridian can overtake him) from thence 
it follows, that a Body, under the .Equato**, moves 
“ through 1426,88 Feet, in the Space of one Second of 
K 1 ime. Now, according to the Theorem given us bv 
“ Sir Ifaac Newton in his Thilofophia Naturalis 
“ Trincipa Mathematics Schol. Prop. 4. Lib 1. The 
* Centrifugal Force of any Body has the fame Propor- 
* tion to the Force of Gravity, that the Square of the 
Arch, which a Body defcribes in a given Time, di- 
“ vided by its Diameter, has to the Space, through which 
“ a heavy Body moves, in falling from a Place in which 
« it was at reft in the fame Time ; and fuppofing a heavy 
“ Body falls i* Foot in a Second of Time, by°Calcula- 
<c tion, it will from thence follow, that the Force of 
« Gravity has the fame Proportion to the Centrifugal 
Force at the Equator, that 289 has to Unity • and 
“ therefore by this Centrifugal Force which arifes from 
cc the Diurnal Rotation of the Earth round its Axis ; 
“ any Body, placed in the Equator, lofes # ¥7 Part of its’ 
“ Gravity, which it wou’d have were theEarth at reft, 
“ or which is the fame Thing, a heavy Body plac’d at 
either of the Poles (where there is no Diurnal Rota- 
« tion, and confequently no Centrifugal Force) which 
“ weighs 289 Pounds, if it were brought to the Equator, 
* wou’d weigh only 288 Pounds. 
^ Having thus determin’d the Proportion of the Ceu- 
** trifugal Force, at the ./Equator, to the Force of Gravitv, 
* it will be eafy from thence to flaew their Proportions 
any Parallel:, for it is. compounded of the Pro- 
w portion of One to 289, and of the Co-fine of the La- 
titude to the Radius ; for if two Bodies defcribe diffe- 
* rent Peripheries in the fame Time, their Centrifugal 
“ Forces 
