December 21

December 21 is the 355th day of the year (356th in leap years) in the Gregorian calendar. 10 days remain until the end of the year.

In the Northern Hemisphere, December 21 is usually the shortest day of the year and is sometimes regarded as the first day of winter. In the Southern Hemisphere, December 21 is usually the longest day of the year and occurs during the southern summer.

Events

Births

Deaths

Holidays and observances

References

  1. ^ Stanley Sandler (2002). Ground Warfare: An International Encyclopedia. ABC-CLIO. p. 923. ISBN 978-1-57607-344-5.
  2. ^ Philippe Levillain (2002). The Papacy: Gaius-Proxies. Psychology Press. p. 732. ISBN 978-0-415-92230-2.
  3. ^ Ranter, Harro. "ASN Aircraft accident ATR 72-202 B-22708 Makung City, Penghu Islands". aviation-safety.net. Retrieved 2019-08-03.
  4. ^ Cardozo, Nancy (2000). Maud Gonne. New York: Amsterdam Books. p. 12. ISBN 978-0-9415-3395-9.
  5. ^ Sicherman, Barbara; Hurd Green, Carol (1983). Notable American Women: The Modern Period. Cambridge MA: Belknap. p. 129. ISBN 978-0-6746-2733-8.
  6. ^ Grinstein, Louise S.; Campbell, Paul J. (1987). Women of Mathematics : a Biobibliographic Sourcebook. New York: Greenwood Press. p. 30. ISBN 978-0-3132-4849-8.
  7. ^ Henderson, Harry (2003). A to Z of Computer Scientists. New York: Facts on File. p. 99. ISBN 978-0-8160-4531-0.
  8. ^ Oakes, Elizabeth H. (2007). Encyclopedia of World Scientists. New York: Facts on File. p. 179. ISBN 978-0-8160-6158-7.
  9. ^ Poonawala, Ismail K. (2009). "ʿAlī b. al-Walīd". In Fleet, Kate; Krämer, Gudrun; Matringe, Denis; Nawas, John; Rowson, Everett (eds.). Encyclopaedia of Islam, THREE. Brill Online. ISSN 1873-9830.
  10. ^ Smith, Jessie Carney; Phelps, Shirelle (1996). Notable Black American Women. VNR AG. p. 11. ISBN 978-0-8103-9177-2.

External links

Other Languages

Copyright