It is candle day or Imbolc. For those who practice the ancient ways, Light a candle on the night of Feb. 1st. Let it burn all night.
From The Celtic Connection;
Imbolc, (pronounced "IM-bulk" or "EM-bowlk"), also called Oimealg, ("IM-mol'g), by the Druids, is the festival of the lactating sheep. It is derived from the Gaelic word "oimelc" which means "ewes milk". Herd animals have either given birth to the first offspring of the year or their wombs are swollen and the milk of life is flowing into their teats and udders. It is the time of Blessing of the seeds and consecration of agricultural tools. It marks the center point of the dark half of the year. It is the festival of the Maiden, for from this day to March 21st, it is her season to prepare for growth and renewal. Brighid's snake emerges from the womb of the Earth Mother to test the weather, (the origin of Ground Hog Day), and in many places the first Crocus flowers began to spring forth from the frozen earth.