The Rauhnächte come from the word "Rauchnächte" (smoking nights), because in many cultures things were more intensively smoked at around this time. Over the course of time however, the "ch" in the German word was lost. The twelve Rauhnächte fall between the winter solstice on 21 December, which was celebrated by the Celts as the day of light, and Epiphany on 6 January. The four Sundays and holidays are exempted. The night of the winter solstice, the Holy night and the night before Epiphany are the big Rauhnächte.