Science s Alien calendars would probably include leap year

Leap year: The time it takes the Earth to orbit the sun can't be precisely divided into days. Alien planets are likely to have the same difficulty in measuring time accurately.

AP Photo/NASA/Ames/JPL-Caltech

Today is a leap day, a calendar oddity that helps align our timekeeping with the orbit of the Earth around the sun. But leap day may not be restricted to the Earth — it could occur on planets around other stars as well, as long as there are beings living there to mark the days, scientists say.

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