Who invented Leap Years?

  • Marcus Aemilius Lepidus
  • Julius Caesar correct

    Julius Caesar introduced Leap Years in the Roman empire over 2000 years ago. Before Caesar came to power, the Romans used a calendar system based on the lunar cycle, which dictated that there were 355 days in a year. This system was 10 ¼ days shorter than a solar year, the amount of time required for the Earth to make one complete revolution around the sun. After consulting with the astronomer Sosigenes, Caesar implemented a new system, the Julian calendar, which went into effect in 45 B.C. and was made up of 365 days in a year. The calendar was intended to be in sync with the solar cycle; however, because the actual solar year is 365 ¼ days long, Caesar also added an extra day, called a leap day, every four years to make up the difference. The Julian calendar remained the standard until the late 16th century, when a slightly modified version of the system, known as the Gregorian calendar, was introduced. Today, the Gregorian calendar is the world’s most widely used civil calendar.

  • Roger Bacon
  • Quintus Fufius Calenus
  • ON A DAY
  • Fact of the day

    Knitting was initially a male-only occupation.
  • This day in 1374

    One of the first major outbreaks of St. John's Dance erupts​ Aachen, Germany.

    • Roy Disney

      Los Angeles, California
    • Mick Fleetwood

      70 years old | London, England
    • Lionel Messi

      30 years old | Santa Fe, Argentina
    • Jack Dempsey

      Manassa, Colorado