Births on April 5

Sébastien Érard, French instrument maker (d. 1831)

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29 Feb

Konbaung Dynasty
King Alaungpaya founds Konbaung Dynasty, the last dynasty of Burmese monarchy.
15 Jun

Lightning
Benjamin Franklin proves that lightning is electricity (traditional date, the exact date is unknown).
2 Sep

Western Europe
Great Britain adopts the Gregorian calendar, nearly two centuries later than most of Western Europe.
14 Sep

Gregorian calendar
The British Empire adopts the Gregorian calendar, skipping eleven days (the previous day was September 2).