THE SATELLITES OF SATURN.
| Name. | Mean Distance from Centre of Saturn. | Periodic Time. | |||
| Days | Hrs. | Mins. | Secs. | ||
| Mimas | 118,000 miles. | 0 | 22 | 37 | 27.9 |
| Enceladus | 152,000 ” | 1 | 8 | 53 | 6.7 |
| Tethys | 188,000 ” | 1 | 21 | 18 | 25.7 |
| Dione | 241,000 ” | 2 | 17 | 41 | 8.9 |
| Rhea | 337,000 ” | 4 | 12 | 25 | 10.8 |
| Titan | 781,000 ” | 15 | 22 | 41 | 25.2 |
| Hyperion | 946,000 ” | 21 | 7 | 7 | 40.8 |
| Iapetus | 2,280,000 ” | 79 | 7 | 54 | 40.4 |
A ninth satellite was discovered in August, 1898, by Prof. W. H. Pickering, but its mean distance and periodic time have not yet been determined with precision.