February 9 is the 40th day of the year in the Gregorian calendar. It is known for various historical events, including the founding of the National Football League in 1920 and the first appearance of The Beatles on the Ed Sullivan Show in 1964, which significantly impacted music history. In addition to historical events, February 9 is also recognized for several observances. For example, it is celebrated as National Pizza Day in the United States, encouraging people to enjoy this popular dish. The day often serves as a reminder of the changing seasons as winter progresses toward spring.