Why the conjunction of Jupiter and Saturn is important in Islamic history Why the conjunction of Jupiter and Saturn is important in Islamic history The conjunction was believed to mark the arrival of a divinely guided universal ruler On December 21, 2020, the day of the winter solstice, the world will witness a planetary conjunction of Jupiter and Saturn. Though a conjunction of these two planets happens every twenty years or so, rarely do both of them come quite so close to each other or are so clearly visible in the sky. In fact, the last time these two planets appeared in such close proximity was on July 16, 1623; and the last time such a conjunction occurred at night (when it could actually be observed by the naked eye) was March 4, 1226.