Tomorrow is Candlemas: the midpoint of winter, halfway between the solstice and the equinox, in cultures unspoiled by scientifically rational astronomy the first day of spring, and in much of Western Europe traditionally the day to break ground for the first of the year’s crops. Pagans had astronomy plenty to mark the day, often (plausibly, to celebrate the returning of the light) with fire. The Catholic Church, as it so often did, co-opted the festival for its own purposes, using the day to celebrate the purification of Mary forty days after giving birth to Jesus, the light of the world. And so Catholics brought their candles to the church to have them blessed, whereupon the candles became talismans that could be lit during storms or times of trouble, as an old English poem observed: