Earth's seasons, equinoxes & solstices Season to Season: Earth's Equinoxes & Solstices that awesome graphic that was here on March 20th, is now in Astronomy, & Science & Nature > Earth Science and > Weather.
The Celtic celebration of the winter solstice was called the Alban Arthuan, one of four celebrations that marked the solstice and equinox positions of the sun. Alban Arthuan was a festival of peace and a celebration of waxing solar light. Many honored the forthcoming Sun child by burning an oaken Yule log, and honored the Goddess in her many Mother aspects. The Father God was honored in various forms: as Santa Claus, the Old Sky God, Father Time, and the Holly King.
Where all belief system originate from Egyptian, Babylonian, Isrealite, Mongols, Episcopalian, Catholics etc.... Here is a great chart of the Wheel Of The Year, it includes, the 8 Sabbats, The Solstices and Equinox, the Astrological signs, the Native American Astrological signs, the directions, the colours of each seasons, the moon names and the element representing each.
From the moment of the September Equinox, the Sun's strength diminishes, until the moment of Winter Solstice in December, when the Sun grows stronger and the days once again become longer than the nights.