Today is the winter solstice (the shortest day of the year). It is also the day that Jupiter and Saturn are so closely aligned that they appear like a single point of light in the sky. The Jupiter-Saturn conjunction (the planets closest approach) occurs every twenty years, although typically the conjunction isn’t so close. The planets have only been this near seven times over the past 3,000 years (and two of those times the planets were too close to the sun to be seen). The timing this year was perfect, just the right amount of time after sunset, just the right latitude (not Antarctica), and just the right cloudless Southern Californian sky.