parallax of certain fixed, stars . 291 
aberration is to increase parallax. I have therefore used 
for my recent observations 2.o''±, and corrected my former 
ones, which were computed with 20" max. of aberration; thus 
using the most unfavourable quantity. 
Summer Z. dist. Jan. 1, 1815. 
N°. Ob. 
0 / // 
1811 & 1812 
1814 
1815 
1817 
23 
10 
20 
14 . 
8 45 45.71 + . 74 P 
45,97 + ,72 p 
46,12 + ,43 p 
45,22 + ,68 p! 
67 
Winter Z. dist. Jan. 1, 1815. 
N°. Ob. 
0 / n 
1810-13 
1814-15 
1816-17 
24 
12 
16 
8 45 47 , 1 2 — , 7 6 P 
46,79 — ,80 p 
46,57 — ,76 P 
52 j 
The correct means of the preceding results being taken by 
attributing to each a weight proportional to the number of 
observations, we obtain 
8° 45' 46" ,86 — ,77 p = 8“ 45' 45" ,77 + ,63 p 
OT P = tS = 78 
or 2 p = T',56, the angle subtended by the diameter of 
the earth's orbit at the Star. 
Qq 
MDCCCXVIII. 
