1644

1644 (MDCXLIV) was a leap year starting on Friday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1644th year of the Common Era (CE) and Anno Domini (AD) designations, the 644th year of the 2nd millennium, the 44th year of the 17th century, and the 5th year of the 1640s decade. As of the start of 1644, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

Millennium:	2nd millennium
Centuries:	16th century – 17th century – 18th century
Decades:	1610s  1620s  1630s  – 1640s –  1650s  1660s  1670s
Years:	1641 1642 1643 – 1644 – 1645 1646 1647

1644 in other calendars

Gregorian calendar	1644 MDCXLIV
Ab urbe condita	2397
Armenian calendar	1093 ԹՎ ՌՂԳ
Assyrian calendar	6394
Balinese saka calendar	1565–1566
Bengali calendar	1051
Berber calendar	2594
English Regnal year	19 Cha. 1 – 20 Cha. 1
Buddhist calendar	2188
Burmese calendar	1006
Byzantine calendar	7152–7153
Chinese calendar	癸未年 (Water Goat) 4340 or 4280     — to — 甲申年 (Wood Monkey) 4341 or 4281
Coptic calendar	1360–1361
Discordian calendar	2810
Ethiopian calendar	1636–1637
Hebrew calendar	5404–5405
Hindu calendars
- Vikram Samvat	1700–1701
- Shaka Samvat	1565–1566
- Kali Yuga	4744–4745
Holocene calendar	11644
Igbo calendar	644–645
Iranian calendar	1022–1023
Islamic calendar	1053–1054
Japanese calendar	Kan'ei 21 / Shōhō 1 (正保元年)
Javanese calendar	1565–1566
Julian calendar	Gregorian minus 10 days
Korean calendar	3977
Minguo calendar	268 before ROC 民前268年
Nanakshahi calendar	176
Thai solar calendar	2186–2187
Tibetan calendar	ཆུ་མོ་ལུག་ལོ་ (female Water-Sheep) 1770 or 1389 or 617     — to — ཤིང་ཕོ་སྤྲེ་ལོ་ (male Wood-Monkey) 1771 or 1390 or 618

Events

• February to August – Explorer Abel Tasman's second expedition for the Dutch East India Company maps the north coast of Australia.
• April – A popular Chinese Uprising led by Li Zicheng enter and conquer Beijing, prompting Chongzhen, the last emperor of the Ming Dynasty, to commit suicide.
• June 6 – The invading Manchu army, with the help of Ming general Wu Sangui, captures Beijing, China. This marks the beginning of the Qing Dynasty (also known as the Manchu Dynasty), the last imperial dynasty of China.
• July 2 – Battle of Marston Moor, a crushing victory for the Parliamentary side of the English Civil War, ends Charles I's hold on the north of England.
• September 1 – Battle of Tippermuir, Montrose defeats Elcho's Covenanters, reviving Royalist cause in Scotland
• September 2 – Second Battle of Lostwithiel, the last major victory for Charles I and the Royalist side in the English Civil War.
• September 15 – Pope Innocent X is elected to the Papacy, in Rome.
• November 23 – Areopagitica by John Milton is published.
• December – Plague breaks out in Edinburgh.