'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. via Pocket http://www.bbc.co.uk/news/uk-scotland-north-east-orkney-shetland-23286928#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa