To confirm that the Charter of Christ embraces the profane cycle of life, the early Church adopted observances of the solar calendar from many different cultures. The most significant of these are obvious; Easter, on the spring equinox, and Christmas, on the winter solstice.
Others include All Saints’ Day, the mid-point between the autumnal equinox and the winter solstice; Lammas Day, the mid-point between the summer solstice and the autumnal equinox, while May Day, in between the spring equinox and the summer solstice (Beltane in the Celtic calendar) marks a celebration of the Virgin Mary in Christian culture.
February 1-2 falls between the winter solstice and the vernal equinox, marking the middle of solar winter in the northern hemisphere. Called Imbolc in the Celtic calendar, Christians observe the date as Candlemas, but most of us know it as Groundhog Day.