[AZ-Observing] Re: Two spots on Jupiter

It is possible, but this only occurs near opposition.

Currently (10:00 p.m. MST), Callisto is transiting Jupiter with Ganymede's 
shadow transiting just below it.  I'm using WinJupos software, and it shows 
Callisto's shadow beginning its transit at about 1:20 Tuesday morning, when 
Jupiter is pretty low in the southwest.

Tom
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