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Hi Peter
I use a program called "Jupiter 2" which gives you a visual representation of the current Jupiter system, position of moons and the GRS. It's also great to go forwards and backwards in time to verify what you saw, or to plan to view the next transit.
It also lets you flip the N-S and E-W orientation to match what you see in the eyepiece. Just go out tonight and check the positions of the moons ni the eyepiece in relation to how they appear in the software, and set the orientation accordingly. Then you'll be right for future events.
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