Alfred Watkins never ran the numbers. Here his method runs itself: a line-finding search over 661 real Wiltshire barrows, checked against the same search run on a scatter of random points — so you can watch how many "alignments" chance alone hands you.
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Overview — every alignment found
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Method: Hough-transform collinearity search · client-side · no tracking
Every real-barrow alignment the current parameters turn up, drawn together. Pick one from the list to isolate it and see the sites in order.
—drag to pan · scroll to zoom · click a marker or a line