october 9 in history: what happened to that day

On a visit to the Russian Empress Catherine II in 1773, the French enlightener Denis Diderot arrived for six months.

In 1874, the Universal Postal Union was founded in Berne, Switzerland, and now has the status of a specialized agency of the United Nations.

On this day, but in 1890, near Paris, the French self-taught engineer Clément Ader was the first in the world to take off on a self-propelled manned vehicle heavier than air and flew 50 meters on it.

And in 1965, the Beatles song “Yesterday” topped the American chart.

On October 9, the French mathematician, poet, linguist Claude Gaspar Bache de Mesiriac (1581); the German-Hungarian physicist who created the prototype of the hydraulic turbine Johann Segner (1704); the Russian artist, philosopher, archaeologist, traveler, writer, public figure Nicholas Roerich (1874); the Soviet politician, state and party figure, academician of the Academy of Sciences of the USSR Nikolai Bukharin (1888).