Holidays and observances on December 21

7 observances are celebrated on December 21 around the world: Armed Forces Day (Philippines), Christian feast day: O Oriens, Christian feast day: Peter Canisius, Christian feast day: Thomas the Apostle, Christian feast day: December 21 (Eastern Orthodox liturgics), Forefathers' Day (Plymouth, Massachusetts). The list gathers national holidays, international days and religious or civil observances falling on this date in different countries, as recorded on Wikipedia. Some are fixed and recur on the same day every year; others depend on the local calendar. Each links to the article explaining its origin and meaning.

38 documented historical events happened on December 21, from antiquity to the present day. The best known is this: Lamberto Scannabecchi was elected pope, taking the name Honorius II. On the same day, in another year: The Pilgrims aboard the Mayflower landed at present-day Plymouth, Massachusetts, to establish the Plymouth Colony. On Almanaccolo every event is listed in chronological order, grouped by century, and links to the Wikipedia article it comes from, so you can always read further or check the source. Alongside the events you find who was born and who died on this date, and which observances are celebrated around the world.