The Great Conjunction and Winter Solstice take place on Monday
The Winter Solstice, which takes place on December 21, marks the beginning of winter in the Northern Hemisphere. It is also the shortest day and longest night of the year.
The Great Conjunction will also occur on Monday, an event which the two largest planets in our solar system – Jupiter and Saturn – will nearly overlap to form a "double planet."
While the two planets near each other in a conjunction once every 20 years, humans haven't been able to see them this closely aligned in about 800 years; the only intervening great conjunction occurred during daylight.
"Based on their orbits, from our vantage point on Earth, Jupiter and Saturn will cross within .1 degrees of each other (a fraction of the width of the full moon)," reads a description of the event by Google.
Google and NASA have provided some tips on how best to see this spectacular great conjunction.