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JupiterMoons is your essential guide to observing the king of planets whenever Jupiter reigns over t

SkyWeek is the new, interactive, mobile version of Sky & Telescope magazine’s super-popular “This We

Let SaturnMoons guide you to observing Saturn’s complex system of rings and moons. Sky & Telescope’s

SkyWeek Plus is the new, enhanced version of SkyWeek — a day-by-day calendar of events to observe in