>Rather, the recumbent and flankers create a window on the horizon through which the moon, in its >risen state, shines in on the observers.

I vaguely recall some mention of that in a little touristy panel at Archaeoquest near Aberdeen.
And an even vaguer recollection of some talk of cup-marks on RSCs being somehow moon related.

RSCs are still a bit of a sore point in our house. The exhaust fell off the car that day, we saw nowt but garages. Pleh!