one of the hypotheses regarding the Ishango Bone* is that it might have been a 20'000 year old tracker (physical notches being fairly private as records go) *

one of the hypotheses regarding the Ishango Bone* is that it might have been a 20'000 year old tracker (physical notches being fairly private as records go) * https://en.wikipedia.org/wiki/Ishango_bone#Astronomical https://en.wikipedia.org/wiki/Ishango_bone#Astronomical