Happy Winter Solstice
The solstice itself may have been a special moment of the annual cycle of the year even during Neolithic times. Astronomical events, which during ancient times controlled the mating of animals, sowing of crops, for example, show how various cultural mythologies and traditions have arisen.
Since the event is seen as the reversal of the Sun's ebbing presence in the sky, concepts of the birth or rebirth of sun gods have been common and, in cultures using winter solstice based cyclic calendars, the year as reborn has been celebrated with regard to life-death-rebirth deities or new beginnings such as Osiris, Jesus, and Baldur.
In Greek mythology, the gods and goddesses met on the winter and summer solstice, and even Hades enter Mount Olympus for the meeting (his domain is the underworld so he of course does not have time for Olympian’s meeting any other time). Also reversal is yet another usual theme as in Saturnalia's slave and master reversals see.
Happy Birthday to all the Sun Gods*
This is only a handful of Sun Gods