Tuesday, March 4, 2025

Two Shadows and the Red Spot Cross Jupiter

From time to time, observers with good quality telescopes can watch the small, round, black shadows of the Galilean moons traverse Jupiter's disk. On Tuesday evening, March 4, sky-watchers located in the eastern Americas can watch two
of the shadows and the Great Red Spot crossing the southern hemisphere of Jupiter together for about 90 minutes. At 6:36 p.m. Eastern Time (or 23:36
UT), the small shadow of Europa will join the red spot and the much larger shadow of Ganymede, which began its own crossing of the planet's south polar zone 55 minutes earlier. Ganymede's shadow and the spot will leave Jupiter at 8:04 p.m. EST (or 01:04 UT on Wednesday), leaving Europa's shadow to continue on alone until 9:10 p.m. EST.

(Data courtesy of Starry Night)
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