74 
Dr. Brinkley on the 
Secular variation of annual precession in difF. decl. = + , 349 
+ ,013 =s= + ,3 62. 
Hence, 
Rate at 17S0 ) . . fc 19 ,6 7 
. 'o 5 in ten years < i . < ’ > 
at 1814 j 1 l 5 18 ,0 3 
reduced to 
S' 19 # > 6 
S 19 >2 
Quantities so nearly equal, prove the uniform variation of 
the difF. of N. P. D. of these stars. 
(2) a. Pegasi and « Serpentis. 
Greenwich. 
Dodagoontah. 
Dublin. 
1755 decl. 
1805, Z. D. 
1823, N.P.D. 
« Serpentis 7 0 iz' 48 " ,6 
5 ° 5 6 ' 59 "> 6 
83° o' 3 6",6 
* Pegasi - 13 53 29 ,7 
1 9 37 
75 44 41 >3 
6 40 41 ,1 
7 6 37 ,4 
7 »5 55 >3 
6 40 41 ,4 
7 6 37 ,4 
(509) 2 5 5 6 >3 
(189) 9 17 ,9 
Secular variation of annual precession in difF. decl. =+,349 
— ,116 = + ,233. 
Hence, 
RatC at Ish } in ten y ears { 5 ‘9 9 } reduced t0 ! 78 ° { f lo 'lj 
From these small difFerences we cannot conclude a southern 
motion in these stars when compared with u Serpentis. Mr. 
Pond's observations made it, in both y and a Pegasi, upwards 
of 2". 
(V.) Sirius has, according to Mr. Pond, a greater southern 
motion than any other star, amounting to 3 ,# ,4 for ten years, 
between 1813 and 1823, compared with its rate for ten years 
at 1784. 
This star, in these latitudes, is far from the zenith, on 
which account, the result of the observations of M. Piazzi, 
