north polar distances of the principal fxed stars. 75 
at Palermo, will be of considerable authority in estimating 
the value of observations made at Greenwich, and in Dublin. 
The Cat, of M. Piazzi, gives, Jan. i, 1 800 
Red. 13 y. (ann. var. 4",4o) 
Jan. 1, 1813 
Red. 10 y. (ann, var. 4'', 44) 
N.P.D. Sirius. 
io 6°27' 6", 2 
+ 57 > 2 
106 28 3 ,4 
44 4 
106 28 47 ,8 
Hence, 
Computed from Palermo Cat. 
Greenwich Cat. 
Dublin Cat. 
1813. 
106 0 28' 3'',4 
0 ,7 
4 >3 
1823. 
106° 28' 4/'',8 
4 ^ >7 
48 ,4 
There can therefore be little doubt, that the apparent 
southern motion of this star at Greenwich, has arisen princi- 
pally from an error in the result of the Greenwich observa- 
tions' of 1813- 
(VI.) Several of the stars of M. Piazzi’s Catalogue have 
been already referred to in this enquiry. It is right to 
remark, also, the general agreement of the Dublin Catalogue 
of 1813, and the N. P. D. distances for 1813, deduced from 
M. Piazzi’s Catalogue, taking the annual variations, (re- 
duced to 1806) that were obtained by a comparison of 
Bradley’s Catalogue of 1755, by Bessel, with the Dublin 
Catalogue of 1823. These variations are given in Table V, 
column 5. 
In this Table, in Column 1, will be found how much the 
respective stars of the Dublin Catalogue of 1813 are north or 
south of their places so computed (predicted) from the Pa- 
lermo Catalogue. 
It is evident here is no southern motion, the mean of all 
