God N

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:
  • Cacao beans used as counters
  • No special counters for 5 (bar)
  • Rules must be memorized
  • No automatic calculation
  • Bi-directional: goes from LC to CR and CR to LC
Thompson Abacus

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