Markings on a stone pillar at a 12,000 year-old archaeological site in Turkey likely represent the world’s oldest solar calendar, created as a memorial to a devastating comet strike, experts suggest.
The markings at Göbekli Tepe in southern Turkey – an ancient complex of temple-like enclosures adorned with intricately carved symbols – could record an astronomical event that triggered a key shift in human civilisation, researchers say.
The research suggests ancient people were able to record their observations of the sun, moon and constellations in the form of a solar calendar, created to keep track of time and mark the change of seasons.
Fresh analysis of V-shaped symbols carved onto pillars at the site has found that each V could represent a single day. This interpretation allowed researchers to count a solar calendar of 365 days on one of the pillars, consisting of 12 lunar months plus 11 extra days.
The summer solstice appears as a separate, special day, represented by a V worn around the neck of a bird-like beast thought to represent the summer solstice constellation at the time. Other statues nearby, possibly representing deities, have been found with similar V-markings at their necks.
Since both the moon’s and the sun’s cycles are depicted, the carvings could represent the world’s earliest so-called lunisolar calendar, based on the phases of the moon and the position of the sun – pre-dating other known calendars of this type by many millennia.
Ancient people may have created these carvings at Göbekli Tepe to record the date a swarm of comet fragments hit Earth nearly 13,000 years ago – or 10,850 BC – researchers say.
The comet strike is suggested to have ushered in a mini ice age lasting over 1,200 years, wiping out many species of large animals. It could also have triggered changes in lifestyle and agriculture thought to be linked to the birth of civilisation soon afterwards in the fertile crescent of West Asia.
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