Samhain is a Gaelic festival marking the end of the harvest season and the beginning of winter or the "darker half" of the year. Traditionally, it is celebrated from the very beginning of one Celtic day to its end, or in the modern calendar, from sunset on 31 October to sunset on 1 November, this places it about halfway between the autumn equinox and the winter solstice. It is one of the four Gaelic seasonal festivals, along with Imbolc, Beltane and Lughnasadh. (Samhain Mandala - CJ Shelton)