* Astronomy

'World's oldest calendar' discovered in Scottish field

Archaeologists believe they have discovered the world's oldest lunar "calendar" in an Aberdeenshire field.
Excavations of a field at Crathes Castle found a series of 12 pits which appear to mimic the phases of the moon and track lunar months.
A team led by the University of Birmingham suggests the ancient monument was created by hunter-gatherers about 10,000 years ago.
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