72 
Dr. Brinkley on the 
(3) Capella and 7 Draconis. 
Dunnose. 
y Draconis o°53' 56" ,7 N 
Capella . 4 50 21 ,7 S 
Clifton. 
i° 56' z6",9 S 
7 40 42 ,7 S 
Arbury Hill. 
o° 42' 2 2", 9 S 
6 26 41 ,4 S 
5 44 18 ,4 
Mean difference 
5 44 15 ,8 
5 44 17 A 
5 44 18 ,5 
Greenwich, 
1755, decl. 
Capella - - 45 0 43' 4", 8 
y Draconis - - 51 3 1 40 ,6 
Diff. 5 48 35 ,8 
From Z. Sector. 
Mean diff. 
5 44 l 7 >1 
5 48 35 >° 
Greenwich. 
o° 2' 2 4", 6 N 
5 4 1 S 1 >° s 
5 44 15 ,6 
Dublin. 
1823, N.P.D. 
44 ° ii' 36",2 
38 29 10 ,3 
5 42 25 ,9 
5 44 *7 A 
(47 y-) 4 18 ,7 (21 y.) I 5* >2 
The secular variation of annual precession in diff. of decl. 
— -{-,622 “{-,202 = -{-,824. 
Hence, 
^ atC a f I« 78 j i n ten years f ^5 >° X reduced to 1780 j ^4 >9 
at 1813 j 7 I52 >o j 1 \ 54 ,7 
a result supporting a uniform variation. 
It may not be without its use in this enquiry, to show 
what the latitude of Greenwich comes out independently on 
the mural circle, viz. by reducing the zenith sector observa- 
tions of 1802 to 1823 (applying an uniform variation, viz. that 
deduced from the variations in 1789, by allowing the changes 
in precession) and then computing from the north polar dis- 
tances for 1823, determined by the Dublin observations. 
Mean Z. D Greenwich, Jan. 1, 1802. 
7 Draconis. yUrsaeMaj. JiUrsseMaj. 
Reduction to 1 823 
o° 2' 24'', 6 N 
— 14 >7 
o 2 9 ,9 
Dublin, N. P. D. 38 29 10 ,3 
3 0 19' 6",o N i° 10' i 7 ",8 S 
— 7 o ,0 + 6 2i",8 
3 12 6 ,0 
35 *9 >5 >» 
1 16 39 ,6 
39 47 59 >9 
Capella. 
5 0 41' 5i",o S 
— 1 35 >3 
5 4° *5 >7 
44 11 36 ,2 
Co-lat. Greenw. 38 31 20 ,2 
38 31 21 ,1 
38 31 20 ,3 
38 31 zo ,5 
