Utilising a bit of software I recently discovered on the net, I can say with confidence that all three stone rows don't quite line up with the sunset position on the shortest day. At least not as the sun set would appear on a flat horizon. Given a viewing angle standing on each of the cist burials and aligning with the sun setting behind Eastern Tor may, however, provide a better alignment on that day.
There is, or at least there was today, a certain atmosphere around the site. Perhaps this was aided by the low clouds and consequent mist, but there was a definite sense of melancholy.
With the help of a willing aid, you get a sense of the enormity.
A place to visit again.