WHAT HAPPENED IN 1675.
Look what happened the 1675.

Battle of Colmar: the French army beats Brandenburg. (5. January 1675)

John Flamsteed is appointed the first Astronomer Royal of England. (4. March 1675)

King Charles II of England orders the construction of the Royal Greenwich Observatory. (4. May 1675)

The foundation stone of the Royal Greenwich Observatory in London, England is laid. (10. August 1675)

Franco-Dutch War: forces of the Holy Roman Empire defeat the French in the Battle of Konzer Brücke. (11. August 1675)

Leibniz makes the first use of the long s (∫) as a symbol of the integral in calculus. (29. October 1675)

Plymouth Colony governor Josiah Winslow leads a colonial militia against the Narragansett during King Philip's War. (2. November 1675)

Gottfried Leibniz demonstrates integral calculus for the first time to find the area under the graph of y = ƒ(x). (11. November 1675)