[ 4^9 ] 
I fhall fpend no more time on the ring, with re- 
fpedt to thofe motions which have nothing to do with 
the fubjedt in queftion j but they {hall be thoroughly 
difcuffed, and applied, in a fecond memoir, which I 
{hail publifh, on the particular motions of the planets. 
SECT. IV. 
Containing the application of the formulae of 
the preceding Se&ions . 
26. The motion of the fun, or, to fpeak more ex- 
actly, of the earth, in the ecliptic, is which is 
the lpace divided by the time. 
27. The earth’s central force will therefore be 
^ x the centra l force being equal to the 
fquare of the motion divided by the diameter of the 
circumference in which the body moves ; and the 
earth’s central force being the force — wherewith it 
s s 
is attracted towards the fun 5 we (hall have 
s s 
2 7T7T 
2 7T 7rS . S 
-JY 5 whence we get - = 
C-rJ'h 
28. The motion of a point of the equator whofe 
radius is a, will be, calling the time of its revolution 
t = which is the fpace divided by the time. 
We have therefore m = 
2 A 
7T 
2 9 ‘ 
