During the evening of Friday January 23/Saturday January 24 there will be a triple shadow transit. This is a rare occurrence where three of Jupiter's moons (Europa, Callisto and Io) pass between Jupiter and the Earth. For a period of time the shadow of the three moons will be visible on Jupiter's disk.
This is easy to observe with a small telescope, provided it is clear and dark at your location while the transit is taking place. For observers in the eastern United States (in the Eastern time zone) here is the timing....
Friday January 23 22:09 Callisto's shadow appears
Friday January 23 23:36 Io's shadow appears
Saturday January 24 00:03 Io begins transit
Saturday January 24 01:27 Europa's shadow appears
Saturday January 24 01:31 Callisto begins transit
Saturday January 24 01:54 Io's shadow disappears
Saturday January 24 02:07 Io ends transit
Saturday January 24 02:17 Europa begins transit
Saturday January 24 02:59 Callisto's shadow disappears
Saturday January 24 04:23 Europa's shadow disappears
Saturday January 24 04:54 Europa ends transit
(These timings are approximate, it is best to start observe a few minutes before the times indicated to be safe). Observers at other locations can adjust the time zone to determine the timings. If the sun is above the horizon at the specified time, you wont be able to see the transit.
See this article from Astronomy Now: "Jupiter’s moon dance and shadow play to delight observers:" http://astronomynow.com/2014/12/03/jupiters-moon-dance-and-shadow-play-to-delight-observers/
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