-The Celtic calendar year was divided into two parts, light, summer and Spring and the dark, Fall and Winter with four great feast days marking the year:
Samhain (November 1) (our Halloween) which was the Celtic New Year, marks the end of the harvest, and the beginning of the dark half of the year. All lights are extinguished until relit by a central bonfire. This day is a "gap" in time and consciousness when travel to the other world and through time was possible.
Imbolc (February 1) (our Ground Hog Day) St.Bridget's Day, which marks the first day of Spring and the middle of the dark half, the time for the reemergence of green things. This marks the first flowing of milk in the udders of the ewes. Associated with the goddess Bríd.
Bealtaine (May 1) The first day of the light part of the year. Cattle are driven through great bonfires to protect them and ensure fertility. Young couples jump through the fire also.
Lúghnasadh (August 1) marks the beginning of harvest and celebrates the victory of the god Lúgh against the earth spirits that would keep the harvest. Lúgh is very much a "Christ" figure in that he died for the sake of humans, pierced and hanging from a tree.