At 8:18 PM PST on Friday, 6 May, one of Jupiter’s moons, Callisto, will pass in front of Jupiter. At 8:32 another Galilean moon, Io, will follow Callisto. Their two shadows will transit the planet’s surface starting at 9:39 PM. The double shadow transit will end at 10:42 PM PST. We’ll have the SCC Observatory open for this double shadow transit at 8 PM, weather permitting.