C 4*5 ] 
Half the difference of thefe two means, is -f 9,92 vern. = -|-8,5" the correction of the 
adjuftment of the micrometer, which only differs -rVth of a fecond from what was found by 
the meafures of Venus’s diameter before. Half the fum of the two means is 10 14,08 = 
54,77" Venus’s apparent diameter, which was found before C4,97". The mean of the two 
refults is 54,87" or 54,9". 
After the laft meafurements of the Sun and Venus’s diameters, I replaced my telefcope on 
the equatoreal ftand, and took the following obfervations. 
lime by 
Apparpnt 
Meafure by 
D®. red. & cor. 
the clock 
time 
micrometer 
in min, & fee. 
H M S 
H M S 
In. pts. V. 
M S 
1 59 37 
2 3 35 
0 85 2I| 
6 29,9 
Dift. of W. L. ofO and ? in lines paral). to the equat. 
2 6 32 
2 10 30 3 45 0 
24 42,0 
Dift. of E. L. of 0 and ? in lines parallel to the equat. 
2 lO 44 
2 14 42'o 05 10 
7 2,8 
Diff. of declin. of N. L. of 0 and $ 
2 14 30 
2 18 28 
3 25 4 
23 20.0 
Diff. of declin. -of S. L. of 0 and ? 
2 17 55 
2 21 53 
10 2 
7 ^7»3 
Diff. of declin. of N. L. of 0 and $ 
2215 
2 25 3 3 25 I 
23 i7’5 
Diff. of declin. of S. L. of G and ? 
2 24 7 
2 28 50 75 20 
5 45.9 
Dift. of W. L. of 0 and $ in lines par. to the equat. 
2 27 54 
2 3* 52.'3 65 0 
26 7,4 
Dift. of E. L. of 0 and ? in lines par. to the equat. 
Here follows the Table of the value of the fcale of the objeCl glafs micrometer, wliich 
was delivered in by Mr. Short, together with the telefcope, by which the reduCfions of the 
foregoing obfervations were made. 
Table for the objeCt glafs micrometer j the focal length of which objeCl glafs is = 
482,867 inches. 
Inches 
Correfponding 
angle in 
min. and fee. 
Dec. of 
an inch 
Angle in 
min. and fee. 
Parti of 
the ver. 
Angle in 
feconds 
/ // 
/ 
// 
n 
1 
' 7 7.2 
>05 
0 
21,4 
I 
0,9 
2 
H * 4>3 
,10 
0 
42,7 
2 
*./ 
3 
21 21,4 
.15 
I 
4.1 
3 
2,6 
4 
00 
00 
"0 
,20, 
I 
25.4 
4 
3.4 
5 
00 
to 
to 
I 
46,8 
5 
4.3 
.30 
2 
8,1 
6 
.35 
2 
29.5 
7 
6,0 
,40 
2 
50.9 
8 
6,8 
.45 
3 
12,2 
9 
7.7 
>50 
3 
33.6 
10 
8,6 
.55 
3 
54.9 
1 1 
9.4 
,00 
4 
16,3 
12 
10,3 
.65 
4 
37.6 
13 
1 1,> 
.70 
4 
59.0 
•4 
12,0 
.7 5 
5 
20,4 
1 5 
12,8 
,«o 
5 
41.7 
10 
•I 3,1 
.85 
6 
3.1 
17 
14.5 
,90 
6 
24.4 
1 8 
15.4 
.95 
6 
45.8 
19 
16,3 
20 
17. t 
2 1 
18,0 
22 
18,8 
23 
‘ 9.7 
24 
2^.5 
Obfervations 
