A precursor to the Mayan calendar................as one epoch ends..........another begins...........only if we can work together..........

Ishango Bone - Mathematics Department of SUNY Buffalo - University ...

www.math.buffalo.edu/mad/Ancient-Africa/ishango.html

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University at Buffalo

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The Ishango Bone, Possibly One of the Oldest Calendars (25,000 BCE ...

www.historyofinformation.com/expanded.php?id=4

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The Ishango Bone, Possibly One of the Oldest Calendars (25,000 BCE – 20,000 ... Paleolithic bone plaques were notation systems, specifically lunar calendars ...

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The Ishango Bone: Craddle of Ancient Mathematics | African Heritage

https://afrolegends.com/2013/08/29/the-ishango-bone-craddle-of-mathematics/

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Aug 29, 2013 - Dating as far back as 22000 years ago, in the Upper Paleolitic era, the Ishango bone is a dark brown bone which happens to be the fibula of a baboon, with a sharp piece of quartz affixed to one end for engraving. It is the oldest attestation of the practice of arithmetic in human history.