| 1618 | | 23 May:
The Thirty Years War, a series of wars fought by European nations for various reasons, is initiated when the Holy Roman Emperor attempts to force Catholicism on most of Europe, and ends with the Peace of Westphalia.OSU CT |
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| 1648 | | 24 Oct:
The Thirty Years War ends with the signing of the Treaty of Westphalia.LoC Avalon |
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| 1713 | | 11 Apr:
The Treaty of Utrecht is signed ending the War of the Spanish Succession, also known as Queen Anne's War in North America.CHNC CBC |
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| 1865 | | 8 Feb:
Gregor Mendel first presents his works on plant hybridization.Nature NIH |
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| 1884 | | 1 Nov:
Greenwich Mean Time is adopted universally when the International Meridian Conference meets in Washington, DC.GMT OFA |
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| 1906 | | 3 Nov:
The distress signal S.O.S. becomes the worldwide standard at the 2nd International Radiotelegraphic Convention.SIMag GA&C |
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| 1914 | |
| 1918 | | Feb:
The Spanish Flu pandemic kills at least 3% of the World's population.VLib npr |
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| 1919 | |
| 1939 | |
| 1945 | |
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| 1954 | | 29 Sep:
The CERN Convention is entered into force.CERN SA |
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