December 21 is the 355th day of the year (356th in leap years) in the Gregorian calendar. There are 10 days remaining until the end of the year.
In the Northern Hemisphere, December 21st is usually the shortest day of the year and is sometimes regarded as the first day of winter. In the Southern Hemisphere, December 21st is usually the longest day of the year and occurs during the southern summer.
Events：
69 – The Roman Senate declares Vespasian as Roman emperor, the last in the Year of the Four Emperors.
1124 – Pope Honorius II is elected.
1140 – Conrad III of Germany besieged Weinsberg.
1237 – The city of Ryazan is sacked by the Mongol army of Batu Khan.
1361 – The Battle of Linuesa is fought in the context of the Spanish Reconquista between the forces of theEmirate of Granada and the combined army of the Kingdom of Castile and of Jaén resulting in a Castilian victory.
1598 – Battle of Curalaba: The revolting Mapuche, led by cacique Pelentaru, inflict a major defeat on Spanishtroops in southern Chile.
1620 – Plymouth Colony: William Bradford and the Mayflower Pilgrims land on what is now known as Plymouth Rockin Plymouth, Massachusetts.
1826 – American settlers in Nacogdoches, Mexican Texas, declare their independence, starting the Fredonian Rebellion.
1832 – Egyptian–Ottoman War: Egyptian forces decisively defeat Ottoman troops at the Battle of Konya.
1844 – The Rochdale Society of Equitable Pioneers commences business at its cooperative in Rochdale, England, starting the Cooperative movement.
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