640

640

640

Calendar year


Year 640 (DCXL) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 640 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

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Emperor Taizong's campaign against the Western Regions states

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  • A surge in atmospheric lead in ice core drilled in the Colle Gnifetti Glacier in the Swiss Alps signals an increase in silver mining because of economic recovery, after natural disasters in 530s and 540s.[6]

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References

  1. Butler, Alfred, "The Arab Conquest of Egypt and the Last Thirty years of Roman Dominion", p. 222
  2. Al Farooq, Umar by Muhammad Husayn Haykal, chapter nr. 21
  3. "Fires, Great", in The Insurance Cyclopeadia: Being an Historical Treasury of Events and Circumstances Connected with the Origin and Progress of Insurance, Cornelius Walford, ed. (C. and E. Layton, 1876) pp24
  4. "What happened to the Great Library at Alexandria?". World History Encyclopedia. Retrieved January 9, 2020.
  5. Hill, John E. (2003). "The Kingdom of Da Quin". The Western Regions according to the Hou Hanshu (2nd ed.). Retrieved 2008-11-30
  6. "Why 536 was 'the worst year to be alive'". sciencemag.org Nov. 15, 2018.
  7. "The Mystery of the Red Queen of Palenque". Uncovered History. December 22, 2015. Retrieved January 21, 2019.

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