Archaeoastronomy is a field at the intersection of archaeology, astronomy, and anthropology. It examines how ancient societies perceived, interpreted, and integrated celestial phenomena. It explores the connections between observations of the Sun, the Moon, and the stars and the orientation of monuments, the shaping of landscapes, religious practices, calendrical systems, and patterns of human movement.

The concept of leylines intersects with archaeoastronomy when certain site alignments, along with the buildings and monuments they include, are oriented toward a celestial event occurring on a specific date.

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In this article, the St. Michael’s diagonal crossing England from west to east will be examined in relation to Stonehenge, France’s Mont-Saint-Michel and Ireland’s Skellig Michael.