Sometimes the sun and one of Jupiter's moons line up so that the moon's shadow crosses Jupiter's face. The shadow looks like a black spot on the planet. Tonight two shadows crossed Jupiter together---a photo op! The right shadow is Ganymede's; the left is Callisto's. In between them is the Great Red Spot. To the right and below the planet, you can spot the moons themselves, Ganymede nearer Jupiter and Callisto further away.
This image was shot through my wonderful 6-inch f/8 Newtonian telescope with a QHY5iii485c. 5,268 subframes were taken and 60% of them stacked and sharpened to make this image. The scope is Dobson-mounted, so I dragged the scope twice to make Jupiter transit across the camera chip three times. I'd have used the CFF290 on the NJP, but I can only see Jupiter from the north end of the yard, where I can't see the north star to set up my mount (OK, yeah, without drift-aligning, but we all have our limits).
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