Google Doodle celebrates winter solstice and the 'great conjunction'

Google on Monday celebrated the first day of winter in the Northern Hemisphere and the rare conjunction of Jupiter and Saturn with a doodle, in collaboration with Nasa. Dec 21 marks the winter solstice in the Northern Hemisphere, but in 2020 the longest night of the year is also going to witness Jupiter and Saturn overlapping each other in an event that hasn't been visible since the middle ages.