Jupiter, which rises in the early even. ing, passes on the meridian about 10 p.m., and is thus favourably placed for observation. The 3 larger satellites, Io, Europa and Ganymede, which are of the 6th magnitude, may be also detected in a small telescope. Io accomplishes its side real revolution in 1 day, 18 hours, and 27 seconds; Europa in 3 days, 13% hours; and Ganymede in 7 days and hours. In the latter half of the month, the planet souths an hour earlier, and sets about 3 a.m.
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