Wait, where is this? I was reading today about a site in Scotland that predates Stonehenge (it's over 5,000 years old) and it also predicts the Winter Solstice, among other things (eclipses, conjunctions, etc.) Fascinating how much the ancients knew!
There's also the Dogon tribe in Africa that had a festival every 60 years when Sirius (Dog Star) appeared in a little notch between two mountains.