I always wondered about the changes in alignment of the sun over the millenia. Stars change. I wonder about the sun.
"The 20-minute alignment of the sun will occur on only a few days this week at the Bryn Celli Ddu chamber on Anglesey... Mr Burrow said: 'The sun doesn't move that much on the days around the solstice.' ...'5,000 years ago they had the sophistication to build this monument,' he added."
Lasts 20 minutes, and occurs on more than one day. Whew! What sophisticated builders they must have been! ;') I've always wondered why people like Burrow are amazed by something they are inventing as they go along. :')