Samhain or Sauin is a Gaelic festival on 1 November marking the end of the harvest season and beginning of winter or "darker half" of the year. It is also the Irish language name for November. Celebrations begin on the evening of 31 October, since the Celtic day began and ended at sunset. This is about halfway between the autumnal equinox and winter solstice. It is one of the four Gaelic seasonal festivals along with Imbolc, Bealtaine, and Lughnasa. Historically it was widely observed throughout Ireland, Scotland, and the Isle of Man. A similar festival is held by the Brittonic Celtic people, called Calan Gaeaf in Wales.