Just returned from a successful observation of the equinox sunrise taken from the sole remaining standing stone at Waun Mawn.
The time of the equinox astronomically was only an hour away from the sunrise, so this is the closest exactitude one could ever hopefully wish for, and as you can see, it affirms everything I’ve been proposing with regards this site’s most likely function.
This is the site in the Preseli Hills, where a prototype Stonehenge circle has recently been proposed, later transported to make the original outer ring of bluestones, at Stonehenge. See my discussion here.