and the txvo innermofl Satellites of Saturn. ' 28% 
‘ould thew the two innermoft; and yet I know, with the 
utmoft certainty, that this was the cafe. 
'L. On the 17th of February 1797, after having furveyed 
with | it every thing remarkable in regard to Saturn, M. 
“Harding obferved, about 7h, 23m. true time, at a, (fig: 4. ) 
a difficult to be diftinguifhed taint luminous ‘point, w hich 
he was inclined to confider as the fixth fatellite.” TI diftin- 
PES ee = Se 
guifhed it alfo; and both our delineations of’ its pofition 
coincided fo far, thatit was feen, according to its proportional 
“diftance from the ring, ur the orbit of the fixth fatellite. 
Its light, on account “at its very {mall fize, was fo wéak that 
it was not always diftincuifhable, but only now and then 
by intervals. 
te. if. ‘About cleven o’élock k> the fame je evetine our cliferva- 
tions 5 were continued 5 and though it was difficult to find this 
point again, it was at length difcovered by us both.- “About 
“ah. 24m. it appeared to have’moved ‘the confiderable’ 
fegment. from a to b, in the orbit of the fixth fatellite. 
This was fufficient to convince us that we had obferved that 
/— fatelite with the thirteen fect refle&or and a magnifying 
__ power of 288; for in both points’ its diftance from” ihe Ting 
‘according to the proportion of the ellipfe, amounted, Hike 
_that of the fixth faccllite, to only % of the diameter ‘of ‘the 
4 fing. ad. Saturn was rettograde, 2 according to caleula- 
_ ton, receded weftwards 3°3 feconds, in four’ hours, from 
was 23m. to 1rh. 24m, Had it’been a fixed ftar, it 
mutt haye appeared about rrh. 24m! nearly 3°3 feconda 
farther from a towards the eaft, inftead of having moved 
7 4 Pweltirards tod. It could, therefore, be no fixed far, but a 
. - fatellite, 3d. If the fegment a, 6, which it’ appeared ‘to 
have paffed over, be keducedto the orbie'e dhe-ixteeel. 
Tite, the port in the courfe of four hours had not completely 
_ “moved + of that orbit; and therefore gives a period of 
fomew hat more than 32 hours. The fynodical period’ of 
__ the fixth ‘fatellite, according to ‘the determination’ of ‘Dr. 
Herfchel, 
38 
a 3 
