Saint Petersburg, formerly known as Petrograd (Петроград) and later Leningrad (Ленинград), is the second-largest city in Russia, after Moscow, the nation's capital. It is situated on the River Neva, at the head of the Gulf of Finland on the Baltic Sea. With an area of 1,439 square kilometres, Saint Petersburg is the smallest administrative division of Russia by area. The city had a population of 5,601,911 residents as of 2021, with more than 6.4 million people living in the metropolitan area. Saint Petersburg is the fourth-most populous city in Europe, the most populous city on the Baltic Sea, and the world's northernmost city of more than 1 million residents. As the former capital of the Russian Empire, and a historically strategic port, it is governed as a federal city.
In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector—a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day.
On May 7, in the year 1895, In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector—a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day. This event is recorded as a Historical Events event in the history of May 7, one of 309 recorded events on this date across all of history.
Key Facts
- This event took place on May 7, 1895 (AD era).
- It is categorised as a Historical Events event in recorded history.
- Referenced in 6 Wikipedia articles.
- The event is associated with a specific geographical location (see map below).
- Wikipedia source last updated on 5 May 2026.
On This Date in History 309
This article draws on content from Wikipedia, available under CC BY-SA 4.0.
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