Citation Needed - 2. The Shift From Lunar to Solar Calendars and Counting

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Citation Needed

Quoted text:

…the Aztec number system was based on 20. Evidently the idea was to coordinate the counters (the digits) with the things being counted, beginning with the days of the 20-day Aztec month.

Most mathematical historians have explained the fact that the Aztec word for “20” was the same as for “man” by the fact that a human has 10 fingers and 10 toes.

Citation needed.

Perhaps this is answered in Menninger that was originally not fully explained as a full text to cite in the sentence before.

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