Action at Jupiter.

The article focuses on observing Jupiter and its Galilean moons during May 2026, highlighting that this month offers the last favorable telescopic views before Jupiter’s conjunction with the Sun on July 29. It details the visibility and changing apparent size of Jupiter’s disk, the positions and interactions of its four largest moons—Io, Europa, Ganymede, and Callisto—and provides specific timings for phenomena such as transits, eclipses, occultations, and shadow passages. Notably, May 2026 marks the start of the Galilean moons’ mutual-occultation season, occurring about every six years when Earth crosses their orbital plane, with several significant events visible across the Americas. The article also includes a planetary almanac with positional and visibility data for Jupiter and other planets for the month. [Extracted from the article]