Religion, politics, war and, in particular, the position of the sun and the moon can figure into the design of these complex timekeepers.
A watch can say a lot about you — your style, income and level of connoisseurship — but a calendar watch can say things about an entire civilization.
As forms of cultural expression go, timekeeping is as important as language, religion and cuisine; it reflects how a society organizes the daily, monthly and yearly rhythms of life.
What started with sundials and water clocks progressed to measuring time according to lunar and solar cycles, and ended up embracing everything from charting agriculture patterns and scheduling battle plans to plotting
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