C 410 ] 
Let P be b ; C 2o, r ; we fhall have C D = ? ; 
P D = - P‘, the difference & of the arc V £, which is 
u 
the fun’s diftance from the node T, will be 
rrydCD 
CDx&D' 
■ 1 
as is found by thefe two proportions, r : S s ::C D 
~ CDyTs , n CDyJs 
: D w = , and D m = — : « — 
d CD : C s =r : &> D whence we have C D* Ss 
— rry.dC Z) 
C D x $ D 
xSj D — r r y d C D, and d’ r 
r Z z* . 
, — — -= (putting inftead of CZZ and d 1 Z), their 
P ^ # . — r r 
values - and V aa ^ = to the fpace run through 
a rr ) r G 
by the fun S in the ecliptic in an inftant, == 277 -r x *lL 
calling T the time the fun employs in running thro’ 
the whole circumference 2 tt r. 
Whence we have d t = 
d u 
r d u 
2 7 r r V aa — zzzz 2 
rr 
7 T 
V aa — uu 
rr 
By 
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