and the two innermoft Satellites of Saturn. 289 
and periodical change of light towards faintnefs ; but I faw 
alfo to the north-eat, at the diftance from the ring of | of 
its diameter, a very fimall fixed ftar, which was only half as 
perceptible as the paie firft fatellite was during its periodical 
increafe of light. 
M. Harding foon after found not only this fixed flar with 
all the five old {atellites, but obferved alfo, on the weftern fide 
nearer the ring, a ftill paler, more delicate luminous point, 
the fituation of which he fhewed only in general. I fuc- 
ceeded in difcovering it alfo; and both our delineations of 
its pofition being compared, proved that we had both feen it 
very accurately in the fame point, and in the orbit of the 
fixth fatellite. Even if we had not immediately calculated 
the place of this fatellite, we muft, from the proportional de- 
creafe of its light and the foregoing obfervations, have con- 
fidered it as the fixth.. About 8h. 12m. truc time, it ftood 
in; and it afterwards appeared that we had not erred ; 
for M. Harding, having continued the obfervation alone, 
found about 1oh. 3om. that it had proceeded eaftwards 
to /. As Saturn at that time moved daily about two mi- 
nutes towards the eaft, the luminous point 4, had it been 
a fixed ftar, muft have been diftant from Saturn about 10 
feconds weltward. This circumftance, that it not only 
had accompanied Saturn eaftwards, but had moved in its 
orbit, a perceptible portion of a circle, proved with full 
certainty that it was the fixth fatellite, and this was after- 
wards confirmed by calculation; for from 7h. 23m. true 
_time, in the evening, Feb. 17th, when it was firft feen by 
M. Harding, to 8h. 12m. on the 6th of March, 17 days 
© hours 49 minutes had elapfed, during which the fatellite 
had completed 12°43 fynodical revolutions of 1 day 8 hours 
53 minutes g feconds. It muft therefore have moved 
about #3,, or almoft the half of its orbit from a towards 
the weft; and this exaétly agrees with the pofition where we 
both faw it in &. The arc which it had moved over from 4 
to / correfponds alfo, becaufe the fatellite in 2h. 18m. froma 
Vo... II, U Shy 
