Hecho general: 366 is the number of days in a leap year.
Hecho matemático: 366 is the number of days in a leap year.
Trivia: 366 is the number of days in a leap year.
Fecha histórica: December 31st is the day in 1907 that the first New Year's Eve celebration is held in Times Square (then known as Longacre Square) in New York, New York.