What’s the winter solstice? https://kids.nationalgeographic.com/history/article/winter-solstice
The winter solstice marks the exact moment when half of Earth is tilted the farthest away from the sun. It usually happens on December 21 or 22, at the exact same second around the world.
huge tomb mound built in Ireland around 3200 B.C., about a thousand years before Stonehenge