And I've been giving you reminders for the moon rise, when I should have been pointing out the northern moon set. It must be to do with drawing the moon energy down into the earth - symbollically.
Is the location of Falkner's Circle accurately known ? 164m. is quite a close fit and wouldn't need much jiggling to form a better fit. If it's over the hill, and out of sight, it could be an error - after all their dry-stone walling was pretty slap dash.