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Washington State University
College of Arts and Sciences Julian calendar

Origins of Leap Year

Playing leap frog.With 2020 being a Leap Year—a once-every-four-years manifestation created to deal with our imprecise notion of a year being 365 days—WSU experts looked back on the development of the modern calendar.

Ancient civilizations depended on the cosmos above to guide their decisions, said Michael Allen, a senior instructor in physics and astronomy.

“We know from things like Stonehenge that ancient peoples were aware of the motion in the sky and » More …