Champaign-Urbana IL, Ca. 1984
Sir J.E.S. Thompson’s Reconstruction
of a Mayan “Abacus”
Note: The “Cycle” is now called a “Bak’tun”
Features:
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Cacao beans used as counters
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No special counters for 5 (bar)
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Rules must be memorized
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No automatic calculation
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Bi-directional: goes from LC to CR
and CR to LC
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Main web site: http://www.pauahtun.org
