On the Solstice, the sun pauses in the sky before it transitions to a new season. As long as humanity has looked to the heavens and searched for meaning, we have taken this event as a cause for celebration. Less so now, but there was a time when people danced for rain. A time when we knew the meanings of the shape of clouds and the names of the full moon. We once built structures of stone that aligned with the stars on midsummer's day, the longest day, the Solstice.
Call it what you will, but a celebration so specific in time yet so global in performance must come from a quality intrinsic to our very nature, one inherent to our humanity. If we, as Carl Sagan said, are made of star stuff, then on the Solstice day we celebrate our origin; our collective journey through the universe.