414 Mr. Pigott’s Determination of 
Immerfions. 
Emerfions. 
1782, June 3. 
i if 
4 54 
1782, July 2 1 . 
i 
4 
tt 
29 
* 7 8 3 » J ul y 3 - 
4 3 6 
1782, Sept. 17. 
4 
8 
1784, Aug. 4. 
4 36 
1784, Sept. 3. 
4 
53 
i7 8 5> J u *y J 5- 
4 19 
Sept. 5. 
4 33 
J ul y 3 ! * 
4 8 
Sept. 1 2. 
4 
37 
Aug. 30. 
4 3 
1785, Nov. 18. 
4 
46 
Sept. 15. 
4 16 
Dec. 12. 
4 
59 
4 24 1 on a mean 
4 
38 
Therefore, by a mean of the immerfions and emerfions, York 
is 4 7 31" weft of Greenwich. Mr. Goodricke’s emerfion of 
Sept. 17, 1783, is ufed inftead of mine, it being undoubtedly 
tnore exa<ft. 
To enter into any detail concerning the eclipfes of Jupiter’s 
fatellites would be ufelefs, as it is a matter fo amply confidered 
by every aftronomer. I (hall only fay that the exaCtnefs ex- 
pected even from thofe of the firft fatellite is, in my opinion, 
too highly rated. Among the various objections,, there is one 
I have often experienced, and which proceeds folely from the 
difpofition of the eye, that of feeing more diftinCUy at one 
time than at another. It may not be improper alfo to men- 
tion, that the obfervation I fhould have relied on as the beft, 
that of Auguft 30, 1785, marked excellent, and air remarkably 
clear both at Greenwich and York, is one of thofe which differ 
the mo ft from the truth. This I remark without having the 
moll diftant inclination of drawing any conclufion ; a fmgle 
inftance can be of no weight. 
Part 
