This week’s leap year edition lands on Feb. 29. Leap years almost always occur every fourth year on the calendar. Having the extra day in February fall on a Thursday only happens once every 28 years.
According to the Smithsonian National Air and Space Museum: “A calendar year is typically 365 days long. These so-called ‘common years’ loosely define the number of days it takes the Earth to complete one orbit around the Sun. But…