December 21st (583) was a Sunday. It's the 355th day of the year (356th in leap years) in the Gregorian calendar. There are 10 days left to the end of the year.
December 21st Holidays in History
» Christian Calendar of saints or Feast Day:
» O antiphon e.g O Oriens
» Peter Canisius e.g Petrus Canisius
» Thomas the Apostle (Anglicanism)
» December 21 (Eastern Orthodox liturgics)
» Divalia, in honour of Angerona (Roman Empire)
» Earliest date for the winter solstice in the Northern Hemisphere and the summer solstice in the Southern Hemisphere, and its related observances:
» Earliest date for Yule in the Northern Hemisphere, and Midsummer in the Southern Hemisphere. (Contemporary Paganism known as Neopagan Wheel of the Year)
» Sangamitta named Sanghamitta Day (Theravada named Theravada Buddhism)
» Ziemassvētki (ancient Latvia)
» Public holidays in São Tomé and Príncipe called São Tomé Day (São Tomé and Príncipe)