[ 412 ] 
and calling C H, which is = the radius of the circle 
parallel to the ecliptic which the pole P runs thro’, 
g-, we fhall have g = — , and the preceflion A b x 
was 
— - will be likewife A bx^-x Which 
2 4 rr 2 4 r 
to be found. 
And this alfo is the quantity of the preceffion 
during the time the fun paffes from the folftice to the 
equinox, or generally, during the time of each qua- 
drant of the fun’s revolution ; as was feen in Prob. V. 
Remark. 
# 
13. The difference of the fun’s diflance S T from 
the equinodtial point, is equal to the arc the fun goes 
through in the ecliptic, when the node T is fix’d, as 
was fuppos’d in the foregoing Prob. but when the 
node T moves in the ecliptic the contrary way to the 
fun’s motion, the difference of the fun’s diflance from 
the node is equal to the arc gone through by the fun, 
increafed by the arc gone through by the node Y. 
Therefore always taking S s, Jig. 2. n° }. for the 
difference of the fun’s diflance from the node, we {hall 
have ~S s equal to the arc defcribed by the fun, more 
by the arc defcribed by the node. 
But, by the former Prob. we have feen, that the 
arc run through by the pole P in an inftant d t, and 
in a parallel to the ecliptic, whereof g is the radius, is 
AVuyadty ^ =AVu x ^x d t = Ah u u d t . 
P D aP 
u 
The arc run through by the node T will be then 
Abu 
