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Tagged with calendar-computations mathematical-astronomy
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Tonalpohualli calculations
I was doing some math on the Tonalpohualli, the mexica ritual calendar. This calendar has 260 days divided in 13-days periods associated with 20 distinct symbols. Every 13-days period is called a ...
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Seasonal changes in hours of daylight
I will post my own answer to this question unless someone else posts the same answer first, but I am curious to know what other points of view might lead to different ways of answering it.
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