International alignments. It is not the purpose of the MAP project to study these since it's a big question, though other researchers are doing so. Two important known alignments of this kind pass through West Penwith, and they are shown on the map in white.
The Michael Line spans Britain from Cornwall to Norfolk, along the longest east-west axis of the British landmass and generally following the rising point of the sun at Beltane and Lammas. Its Cornish section goes from the Hurlers stone circles in East Cornwall to Carn Brea and then to Carn Lês Boel near Land’s End – passing not far from St Michael’s Mount on the way, at Long Rock.
This is the straight Michael alignment identified by John Michell, not the sinuous Michael and Mary lines identified by Hamish Miller and Paul Broadhurst, which wind loosely around it (see The Sun and the Serpent). They all meet at Carn Lês Boel, as they do at other places on the alignment including at St Michael’s Mount, The Hurlers, Glastonbury and Avebury. The alignment has been calculated to pass right round the world as a great circle line.
There is a subset of this line from the Hurlers, passing exactly through St Michael’s Mount to Tol Pedn Penwith (Gwennap Head), the southwesternmost point of Britain – itself an amazing alignment.
The Apollo Line goes from Skellig Michael in Ireland at least to northern Israel, and probably on to India. It was identifiedby Hamish Miller and Paul Broadhurst. The sinuous Apollo and Athena lines meet at St Michael's Mount, and they leave Penwith at Zennor Head and Gurnard's Head respectively. The straight alignment of this line between St Michael's Mount and Skellig Michael passes across the summit of Watch Croft, West Penwith's highest hill.
These are perhaps more corridors than precise alignments, and they do not touch many local ancient sites. Much research yet needs to be done regarding national- and international-scale alignments such as these.