Jupiter's Rare Triple Eclipse

I just came across this and I think it’s rather cool: Jupiter’s Rare Triple Eclipse :: Astrobiology Magazine :: Search for Life in the Universe

Jupiter has four moons roughly the same size as Earth’s Moon. The shadows of three of them occasionally sweep simultaneously across Jupiter. Viewing the triple shadows in 2004 was special, because two of the moons were crossing Jupiter’s face at the same time as the three shadows.