At Carnac a right angle exists between the extremes of moonrise and moonset, at Stonehenge it is found between the extremes of sunrise and moonset or conversely between the extremes of moonrise and sunset, whereas at Ales Stenar it occurs between extreme sunrise and sunset positions. Thus, each of these places is located at the only latitude in the northern hemisphere where the symbolic “right-angle” serves as a characteristic feature of the local astronomy.
In some ways Malmström's position is puzzling. On the one hand the sky-watchers are found to have been incredibly accurate astronomers and on the other afraid of, or obsessed with, eclipses. Megalithic astronomers would have appreciated eclipses never did any harm except perhaps to a few retinas.