Play the skywatching game long enough, and anything can happen. Well, nearly anything. One of the more unique clockwork events in our solar system occurs this weekend, when shadows cast by three of Jupiter’s moons can be seen transiting its lofty cloud tops… simultaneously. How rare is such an event? Well, Jean Meeus calculates 31 … Continue reading "Rare Triple Transit! There’ll be 3 Moon Shadows on Jupiter on January 24th, 2015"