and Longitude of the Loyal Obfervatory at Greenwich, r 83' 
Difference of meridians of the Royal Obfervatories at Greenwich and Paris, by 
obfervations of eclipfes of Jupiter’s iirfl fatellite, obferved at bo h places. 
By Immerfions. 
Circumftances of 
( 1; cnmftances of 
Difference 
Diff. of 
the obfervati ms at 
the obfervations at 
of 
meridians 
Greenwich. 
the Royal Other* 
meridians. 
corrected. 
vatory at Paris. 
1779, Jan. 11 
/ // 
9 22 
/ y/ 
9 2 9 
6 F. 
Limbs undulating. 
18 
9 3 s 
9 45 
6 F,; air a little hazy. 
Air very clear. 
1780, Jan. 14 
9 5 
9 5 
Air very clear. 
Mar. 18 
9 16 
9 16 
Air very clear. 
Air hazy. 
2 5 
9 8 
9 8 
— — 
Air a little hazy. 
1785, Odt. 1 
9 11 
9 11 
rln contadl with 
| Jupiter’s body. 
A little hazy. 
Mean of 6 iinm. 
9 i 7 
9 19 
By Emerlions. 
Circumflances of 
Circumflances of 
Difference 
Diff. of 
the obfervations at 
the obfervations at 
of 
meridians 
Greenwich. 
the Royal Obfer- 
meridians. 
corredted. 
vatory at Paris. 
1773, Nov. 1 
y / 
9 IO 
y y/ 
9 3 
6F. Air a little hazy. 
1 7 7 5 » Feb - J 5 
i° 44 
10 37 
6 F. Twilight. 
Air very clear. 
Mar. 17 
9 43 
9 3 6 
6 F. Air a little hazy. 
Air very clear.. 
1778, Mar. 13 
10 46 
10 46 
— Bright moonfhine. 
Apr. 12 
9 46 
9 4 6 
Air hazy. 
1779, Mar. 30 
10 43 
i° 43 
— — 
Air hazy. 
9 5 ° 
f 2 F. reflector. Air 
Apr. 1 
10 9 
1 very clear. 
1781, May 24 
9 49 
9 49 
Air very clear. 
3 l 
9 8 
9 8 
— — 
Air very clear. 
1782, Aug. 29 
9 2 7 
9 2 7 
Air very clear. 
1 7 8 3> Au g- 2 
8 54 
8 54 
Air very clear. 
r The fat. very near 
] Jupiter’s difk. 
061 . 26 
9 45 
9 45 
f Air very clear, but 
f Limbs undulating. 
t Jupiter low. 
\ much. 
r 5 -feet refledtor by 
1784, Sept. 5 
9 4 
9 9 
Air very clear. 
J Dollond, magni- 
t fying 43O times. 
1785, Nov. 9 
9 26 
9 26 
f 18 inch refledtor, 
1 new metals. 
16 
9 45 
9 45 
- - 
Hazy, 
Meanofi 5emer. 
9 44?4 
9 4 2 
Menu of 6 imm. 
9 l 7 
9 19 
Mean of both | 
means . [ 
9 3 1 
9 3 °i 
— 
