Ganymede transiting Jupiter, photographed by Voyager 1, 31 January 1979. South is up. (I&r
Ganymede transiting Jupiter, photographed by Voyager 1, 31 January 1979. South is up.(I’m not completely sure that it’s Ganymede: it looks like Ganymede to me, and estimating its orbital speed from the photos gives a decent match to the true value, but I’ve had issues getting moon positions to match the photos from Voyager 1’s approach to Jupiter.) -- source link
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