and Ltongitude of the Royal Obfervatory at Greenwich. 185 
By Erne 
rfions. 
Difference 
of 
meridians. 
1 
Diff. of 
meridians 
correaed. 
Circumftances of 
the obfervations at 
Greenwich. 
Circumftances of 
the obfervations at 
the Hotel de Clugny 
/ // 
/ // 
1775 , Feb. i 
5 
9 3 1 
9 24 
6 F. Twilight. 
Air very clear. 
22 
9 1 
8 54 
6 F. 
Air very clear. 
Mar. 1 
7 
9 l 3 
9 6 
6 F. Air a little hazy. 
Hazy. 
1776, Jan. 26 
9 15 
9 J 5 
— — 
1 7 7 7 > Feb. 
4 
8 5 i 
8 5 i 
Air very clear. 
Air very clear. 
Mar. 24 
9 13 
9 
Air very clear. 
Air very clear. 
3 
1 
9 22 
9 22 
Air very clear. 
1778, Feb. 25 
8 48 
8 48 
— — 
Air hazy. 
Mar. 1 3 
9 15 
9 *5 
— — 
A little hazy. 
Apr. 
5 
9 17 
9 1 7 
Air hazy. 
Air very clear. 
12 
10 1 1 
10 1 1 
— — 
Air very clear. 
May 21 
9 2 9 
9 22 
6 F. 
Air very clear. 
1780, Apr. 1 
9 
9 28 
9 28 
Air very clear. 
May 28 
9 37 
9 37 
- - 
Air very clear. 
1781, May 3 
1 
9 10 
9 10 
- - 
Air a little hazy. 
June 16 
9 25 
9 25 
- - 
Air a little hazy. 
* 7 83, Aug. 
2 
9 23 
9 23 
Air very clear. 
Air very clear. 
25 
9 40 
9 40 
Air very clear. 
oa. 
3 
9 30 
9 3 ° 
Air very clear. 
Air hazy. 
f 18-inch refleaor, 
1785, Nov. 
9 
9 T 4 
9 >4 
l new metals. 
18 
9 12 
9 12 
Air very clear. 
1786, Jan. 
0 
9 5 s 
9 5 8 
Air a little hazy. 
Air hazy. 
Meanof2aemer. 
9 22 
9 20,7 
I 
M. Messier’s achron 
1. telefcope is of 3J 
Mean of 1 8 imm. 
9 22,5 
9 23,7 
feet focus, 40 lines aperture, with mag- 
nifying powers of 70 and 140. 
Mean by both 
9 22 
9 22 
Royal Obferv. - 
welt of Hotel 
— 2 
— 2 
de Clugny 
DifF. of merid. 
of the Royal 
9 20 
9 20 
obfervatories J 
Hence the difference of meridians of the tw’O Royal Obfer- 
vatories, by the obfervations made in the Royal Obfervato- 
ries themfelves, is f go ' ; and by the obfervations made by 
Vol. LXXVIT. B b M- 
WH 
