Anybody know anything about Adam's Calander?

A monolithic structure that some estimate is a 300,000 year old calander that's accurate to this day?

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I googled it. It's in South Africa, many dispute that age estimate, and I for one can't see how you could derive a date from it to say anything about it's "accuracy." I mean, south is south and north is north until the continent drifts, right?