This year brings another February 29. Why do leap years exist? Jim Sowell is a senior academic professional in the School of Physics and the director of the Georgia Tech Observatory. He says leap year was a creation of Julius Caesar.
As of February 29, 2016, the calendar is back on track. Every four years, the addition of one day brings us closer to a more precise calculation of the Earth’s orbit.
Getting to our current calendar system has been a complicated process, mostly because of three important celestial rotations: the Earth’s spin, which gives us the day; the orbit of the Earth around the sun, which gives us the year; and the orbit of the moon around the Earth, the basis for the month.