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Jupiter 2 is an excellent little app however it does have an error. I have pointed it out in an email to the author of the app before the latest version came out but got no response. I see it is still present in the current app. Of course it may just be my installation.
If you enter a fractional time zone e.g. 10h 30m, click the "Now" button and see what you get. The click the real-time button, then go back to the now button (do these steps with little time between them). On my screen the positions of the moons skip by about 5 minutes or so - the "Now" skipping forward in time relative to "real-time". Which is right (i.e. the real-time or the "Now") I leave for you to determine.
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