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Calendar History and Ancient Ways of Keeping Time
The calendar was invented several times in several places in the world. Here is a selection of ancient ways of keeping track of the lunar and solar calendar.
Archaeoastronomy
Archaeoastronomy is the the study of ancient methods and reasons for studying the stars and planets
A.H. (Anno Hegirae)
A.H. (Anno Hegirae) is the calendar designation for the Muslim religion.