Imbolc (or Oimelc / Brigid's Feast) - celebrated around February 1st, it's a time to celebrate the earth beginning to wake from its winter sleep.
Vernal equinox - a springtime celebration of the time when night and day become of equal length.
Beltane - takes place on May 1st and is signified by the lighting of bonfires to honour the Celtic god Bel, the god of light, fire and healing.
Litha (Midsummer's Day) - a feast on June 21st to mark the shortest day of the year.
Lughnasadh (Feast of Bread) - takes place on August 1st in honour of the god Lugh. Also coincides with the beginning of harvest and represents the death of Bel, the Corn King.
Autumn equinox - takes place on September 21st and signifies the last harvest before winter descends.
Hallowe'en - famous celebration on October 31st to remember the dead. Also represents the Earth being put to rest so her fertility can be renewed.
Winter solstice (Yule) - celebrated on December 21st, this marks the longest, darkest night of the year.
As well as being linked to the pagan year, the symbol also has links with other eight-fold systems, such as the trigrams of the I Ching, so has relevance to both pagans and other believers.