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Well, you need Stellarium (free) or an app like SkySafari to tell you when the Great Red Spot is visible (not behind the planet). View the planet when it's as high in the sky as you can get (altitude about 30 degs or more). A magnification of x180 to x200 (6mm EP) would make it easier to see features but you need pretty good seeing conditions. Shadow transits of Jupiters moons are always interesting to watch out for.
Regards, Rob
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