[AZ-Observing] Serendipity

Observing from my driveway tonight I saw something that was unexpected and 
really cool. At about 9:20 local time one of Jupiter's moons (later found to be 
Io) was getting close to the planet's disk.  I decided to wait a few minutes 
and watch it disappear.  Instead, it moved right in front of a cloud band and 
continued to transit Jupiter.  The little white disk was visible for over half 
an hour.  Isn't it great to observe this sort of thing by accident?
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