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Telling the Time – A History of Calendars
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People have tried to count time for about ten thousand years. The Abbasid scholar, Abu Raihan Mohammad ibn Ahmad Al-Biruni, wrote in the year 1000 a history of the calendars used by different religious groups and people. Many of these calendars used the moon as a way of telling the time. Of course, we all understand why. The moon was more important before we had electricity than it is nowadays and it made a great difference to people’s lives if there was a new moon or a full one. Other calendars used the stars.
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