Explanation
A transit could hypothetically be observed from the surface of one of Jupiter's moons rather than from Jupiter itself. The times and circumstances of the transits would naturally be slightly different. Mars's satellites Phobos and Deimos would theoretically be visible at the same time. However, the angular diameter of Phobos would be about 0.01" and Deimos would be less than 0.005", and their maximum separation from Mars would be roughly 3" and 9" respectively, making them very hard to see indeed.
The Mars-Jupiter synodic period is 816.51 days. It can be calculated using the formula 1/(1/P-1/Q), where P is the orbital period of Mars (686.98 days) and Q is the orbital period of Jupiter (4330.595 days). The inclination of Mars's orbit with respect to Jupiter's ecliptic is 1.44°, which is less than its value of 1.85° with respect to Earth's ecliptic.
Read more about this topic: Transit Of Mars From Jupiter
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