Ancient Timekeeping - Efforts to make nature's schedule fit our own have been imperfect from the start. Some ancient calendars, dating to the Sumerians 5,000 years ago, simply divided the year into 12 months of 30 days each. Their 360-day year was nearly a week shorter than our annual journey around the sun.

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http://news.nationalgeographic.com/2016/02/160226-leap-year-science-time-world-cultures-february/?utm_source=Facebook&utm_medium=Social&utm_content=link_fb20160228news-leapyr&utm_campaign=Content&sf21644580=1

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