22ND it should be. Opens at 7:45, but you have to leave before the official opening to the paying public at 9:30. Really, it should be winter solstice sunset but Health and Safety won't let people up there after dark (nothing to do with EH) as there are no lights on the path, and believe me that path can take a huge chunk out of you if you fall on it! The stones used to be lit up some years back but the cops asked EH to turn the lighting off as people were gawking and crashing their cars on the a303.