The Bush Barrow Gold Lozenge, the Solar Hexagon, and the Polar Threshold: A Formal Astronomical Comparison

The Bush Barrow gold lozenge, excavated in 1808 from an Early Bronze Age burial near Stonehenge, hasbeen interpreted either as a solar-observation instrument tuned to the southern British horizon or as a calendrical tally. This paper tests an alternative hypothesis: that the artefact preserves a six-point solar hexagon defined by the four solstitial extremes plus two cardinal eastern and western points, and that this geometry contracts toward a quasi-rhombic form in the polar-threshold zone.We conduct a latitude sweep from 51 deg N (Stonehenge) to 71 deg N and examine the hexagon at two critical thresholds: polar-day onset (PDonset, phi = 65.504 deg N) and polar-night onset (PNonset, phi = 66.638 deg N). At PDonset, the W/E vertex angle is 98.71 deg, close to Thom's ~99 deg obtuse angle. At PNonset, using the disk-centre horizon criterion (h0 = -0.566 deg), the polar-day interval terminates on the thirty-sixth calendar day (day 1 to day 36), matching the lozenge's thirty-six perimeter zig-zag units (nine per side).These three primary correspondences - quasi-rhombic form at PNonset, ~99 deg vertex angle at PDonset, and thirty-sixth-calendar-day alignment at PNonset - do not establish polar manufacture or use. They do indicate a structured convergence, raising the possibility that a British Bronze Age object encodes a highlatitude solar geometry whose closest formal and numerical counterparts lie near the Arctic Circle.