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Figure 6.4. The construct features at Crucuno: The Xs mark the approximate positions of the stones. Drawing by E.F. Milone, after Thom et al. (1973).

highly unlikely that a rectangle with these geometrical and astronomical properties would be set by chance on the line of latitude where they could work. The site is about 9 miles from le Grand Menhir Brisé, which should have been visible at Crucuno. However, we know of no suggestion of an astronomical relationship between the two, and they may not have been contemporary. There was once a somewhat similar rectangle, oriented E-W, at Lanvéoc on the the Crozon peninsula in Finistère. Unfortunately, the surviving drawing of the site is not adequate for determining its geometric or astronomical characteristics with precision (Burl 1993, p. 54).

The principal factor in determining the possible astronomical or calendrical features of a site is the presence of specified types of geometric or astronomical alignments supported or at least not contradicted by the geographical and archeological contexts. For example, if several stones point to a distant artificial foresight, and a standstill Sun/Moon set in a knoll as indicated by the foresight in the epoch (independently determined by archaeological data) when the declination permitted this to happen, and if the probability of a random physical alignment of the stones in this direction were vanishingly small, a moderately convincing case for an astronomical alignment will have been made.

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