[ 43i ] 
found in Art. 29. we fhall have J— - x v x -2- x — 
TT 176 2 
*l = ^x^.*hu 
T 176 r 8 
4 r 
b 
But — is the ratio of the fine of the inclination of 
r 
the axe of the earth to the ecliptic, to the radius, or 
of the fine of 66 degrees 32 minutes to the radius, 
= 9 1 7 - 9 1 9 . anc j ^ ^ i s the femi-circumference of 
10000600 
the parallel to the ecliptic wherein the pole of the 
earth moves, and, confequently, equal to i 80 deg. 
/, which is the time of the revolution of a point 
of the equator, is equal to one day ; and T equal to 
365^ days j we fhall have, then, by fubffituting all the 
values in the preceding formula > -5 — x - ^ . I 2 . 2 ? I 9 x 
3 10000000 
1 1 80 1 
x degrees. This is the preceffion produced 
by the fun during the fpace of 3 months. 
33. Multiplying by 4, we fhall have the annual 
preceffion caufed by the fun = — \ — x x 
r o r: 7 3 6 ft 1 0000000 
180 
x 
2 
degrees, = -~ 
91 72919 ^45 
176 2 “ 3 657 10000000 88 
= (after due redu&ion) 13". 52'". 11"" 
degrees. 
Pro- 
