21 
Distance of the fifth Satellite of Saturn. 
two wires were nearly brought to their proper distance, the 
moment of intersection of the satellite ; and the instant it was 
hid behind the wire, cast my eye on Saturn, which should be 
bisected when the measure is justly taken. But this change of 
attention cannot be made without some very small loss of time. 
To correct this defect I took alternately the bisection of Saturn, 
and cast my eye upon the satellite ; and the bisection of the 
satellite, casting the eye upon Saturn. As the latter w 7 ay 
gives the interval too small, the former gives it too large, and 
between both the true measure may be obtained. I do not, 
however, suppose, that the error of the former method can 
amount to so much as a single second of space ; as, knowing 
the loss of time, I always used the utmost precaution ; and re- 
peated the examination of a measure perhaps 20 times before 
I let it pass. 
2' 20", o. 
b 179b 
Correction of the clock — 
22 h 25' 
1st 
measure g' 43", 767 
22 27 
2d 
g 44 , 444 
22 30 
3 d 
— g 43 ,007 
22 32 
4th 
9 42 >4 99 
22 34 
5 th 
9 40 ,554 
22 36 
6th 
9 43 ’9 6 5 
g' 43",o mean of the six 
measures. 
It grew cloudy, so that no measures later in the night could 
be obtained ; nor could I get another sight of Saturn till Octo- 
ber the 7th, when the satellite w T as far advanced in its orbit, 
on its return towards the planet. 
Supposing the satellite to have been very nearly at its 
