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the sun, the moon and the stars - have provided us a reference for measuring the passage of time througout our existence. Ice-age hunters in Europe over 20,000 years ago used to leave markings in sticks and bones to count days. 5000 years ago, Sumerians developed a calendar that divided the year into 30 day months, a day into 12 periods, and each period into 30 parts. The Hindu Lunar calender, whose origin is difficult to ascertain, remains in use till date. Clocks came in thereafter to augment the calendars.