The first International Congress of Mathematicians is held in Zürich, Switzerland.

The International Congress of Mathematicians (ICM) is the largest conference for the topic of mathematics. It meets once every four years, hosted by the International Mathematical Union (IMU).

Zurich is the largest city in Switzerland and the capital of the canton of Zurich. It is in north-central Switzerland, at the northwestern tip of Lake Zurich. As of December 2024, the municipality had 448,664 inhabitants. The urban area was home to 1.45 million people (2020), while the Zurich metropolitan area had a total population of 2.1 million (2020). Zurich is a hub for railways, roads, and air traffic. Both Zurich Airport and Zurich's main railway station are the largest and busiest in the country.

August 9 is the 221st day of the year in the Gregorian calendar; 144 days remain until the end of the year.