Why is the Russian October Revolution celebrated in November?

Answer:

Answer

At the time of the revolution, the Russian Empire still was using the ancient Julian calendar, which had been discarded some 150 years earlier by most Western countries. The result was that each day in Russia was dated 13 days earlier than the same day in the West.

According to the old calendar, the date of the Bolshevik revolution was October 25. But according to the new Gregorian calendar, the date actually was November 7.

Only after the Bolsheviks established the Soviet Union did the country adopt the new calendar. So it was the Bolsheviks themselves who were responsible for changing the date of their October Revolution of October 25 to the national celebration November 7.