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It's well documented that Stonehenge is a calendar.

According to today's mail on line however, the techniques employed go back far further, to some 10,000 years ago.

It appears that a "giant year clock" has been located at Warren Field,  Banchory, North East Scotland,  which predates the once though oldest, Mesopotamian, "time keeping systems" by 5000 years:

"Warren Field stands out as something special, however. It is remarkable to think that our aerial survey may have helped to find the place where time itself was invented."

"Speaking to the Sunday Times, Vincent Gaffney, professor of landscape archaeology at Birmingham University, said: 'The capacity to measure time if among the most important achievements of human societies and the issue of when time was "created" by humankind is critical in understanding how society developed...

This suggests that early hunter-gatherer societies in Scotland had both the need and ability to track time across the years - and perhaps within the month - and that this occurred 5,000 years before the first formal calendars were created in Mesopotamia"

Banchory is only 30 miles or so from "Royal Balmoral". Both sit on the banks of the River Dee. The Queen normally resides there for a spell, after her ritual summer week in Edinburgh.

cheers