the little ice age

The engravings in Gobkali Tepa are considered to be the oldest calendar in the world. Credit: Dr. Martin Sweatman

A 12,000-year-old lunar-solar calendar - the oldest in the world, was discovered on a column at an archaeological site in Turkey

Research at the 12,000-year-old site of Gobekli Tepe in Turkey suggests that the engravings on ancient pillars probably represent the world's oldest solar calendar, possibly created to commemorate a comet strike