Saturnalia
the feast in honor of Saturn, celebrated by the Romans in December, and regarded as a time of unre- Mimas Enceladus Tethys Dione Rhea Titan Themis Hyperion Iapetus Phœbe Name.
Discovery.
W. Herschel, 1789.
J. D. Cassini, 1684. " " Huyghens, 1655 1672 W. H. Pickering, 1905.
G. P. Bond, 1848.
J. D. Cassini, 1671.
W. H. Pickering. 1898 Hyperion was also independently discovered by Lassel at Liverpool only two days later than Bond's discovery. The range of the satellite system is enormous.
The period of Iapetus is almost as long as that of Mercury. Iapetus is also remarkable for its variations in brightness. On the W. side of the planet it is about twice as bright as on the E., which shows that it rotates once on its axis during one revolution, keeping the same face toward Sidereal Period D.
H.
M. 0 22 37 1 8 53 1 21 18 2 17 41 4 12 25 13 22 41 20 20 24 21 6 39 79 { 7 54 546 12 0 strained license and merriment for all classes, even for the slaves. Hence, any time of noisy license and revelry; unrestrained, licentious revelry.