Leap year: why 2024 has February 29. What is the origin of the extra day on the calendar.
The challenges of an emperor and a pope to measure time. Why it is not always a leap year every four years. When will the next leap year be. The origin of leap years dates back to more than two thousand years ago. The most used civic calendar today, the Gregorian, is just one of many systems that humanity has devised to keep a chronology and try to synchronize the measurement of time.