solstice

To light a fire is the instinctive and resistant act of men when, at the winter ingress, the curfew is sounded throughout nature. It indicates a spontaneous, Promethean rebelliousness against the fiat that this recurrent season shall bring foul times, cold darkness, misery and death. Black chaos comes, and the fettered gods of the earth say, ‘Let there be light.’
Thomas Hardy, Return of the Native 

Photo from lilliebe

See also: a history of solstice rituals.