14 D. Kirkwood on certain Harmonies of the Solar System. 
/ 4. The radius of gyration of the sixth primitive ring is 
0-26289. This distance is near] ual to that of Mercury’s 
poemalion: Between this and the limit, 0°20299, the formula 
Application to the Secondary Systems. 
I.——THE SATELLITES OF SATURN, 
The distances . ache satellites of Saturn, in radii of the pri- 
mary, are as follo 
L as, 31408 
| Enceladus, 40319 
ee Tethys, 4°9926 
Dione, 6-399 
WI Rhea, 8932 
IV Titan, 20-706 
* 7 Hyperion, 25°029 
ete Tapetus, 64359 
This table is taken from Loomis’s Practical Astronomy. The 
distances, we are informed by the author, ‘ were derived chiefly 
from Midler, modified in some instances by comparison with 
Herschel’s ‘Astronomy and. Hind’s Solar System.” A chasm in 
the order of distances is observed between Rhea and Titan, and 
exist in sin thas intervals? y career teas these two satellites 
rs rag nak btain a series of ten terms, in which the 
eight known distances are ré resented. with perfect accuracy. It 
is also are that the limit of the ring-forming process, 
a 
Pn Aa a eR ES rs 
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