The winter solstice is the moment in the year when Earth is tilted as far away from the sun as it will be all year. The winter solstice results in the shortest day of the year, meaning it has the longest period of darkness. Fire and light are traditional symbols of celebrations held on the darkest day of the year.
The winter solstice is the day of the year with the fewest hours of daylight, and it marks the start of an astronomical winter. After the winter solstice, days start becoming longer and nights shorter as spring approaches.