It has long been well known that the Mexican numeration is vigesimal, and, as far as I know, there is no proof that it was ever used in the calculation of long reaches of time. The Cakchiquel numeration is also vigesimal, and Brinton states (Maya Chronicles, p. 44) that the Maya numeration is also vigesimal, giving 20 units = one kal = 20 20 kal = one bak = 400 20 bak = one pic = 8000 20 pic = one calab = 160000, etc.…
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