ACOUSTIC RESONANCE ENCODING AT STONEHENGE: Evidence for Rios Harmonic Law at Britain's Most Celebrated Neolithic Monument (3000–1600 BCE)

Stonehenge, located on Salisbury Plain in Wiltshire, England, is one of the most studied prehistoric monuments in the world. Constructed across multiple phases between approximately 3000 and 1600 BCE, the site consists of concentric arrangements of standing stones, earthworks, and associated features including the Aubrey holes ring, the sarsen circle, the trilithon horseshoe, and the bluestone arrangements. Despite extensive archaeological and acoustic investigation, a systematic analysis of Stonehenge's dimensions against the acoustic frequency pair central to Rios Harmonic Law has not previously been conducted. This paper presents that analysis, demonstrating that 15 of 18 measured structural dimensions (83.3%) encode the frequency F#6 (1,479.97 Hz) through standing wave harmonic resonance at less than 1.0% deviation. Two dimensions achieve simultaneous dual-frequency encoding of both F#6 and D#2 (77.78 Hz): the sarsen circle circumference (94m) at F#6 0.0221% and D#2 0.8641%, and the overall enclosure diameter (110m) at F#6 0.0265% and D#2 0.2244%. Notably, the average trilithon height (7.3m) — the defining architectural element of Stonehenge — achieves F#6 encoding at 0.0067% deviation, among the most precise single-dimension hits in the acoustic standardization framework. The Aubrey holes ring (87m diameter), representing the oldest phase of Stonehenge construction at approximately 3000 BCE, also encodes F#6 at 0.0304% deviation, suggesting the acoustic encoding tradition at the site predates the sarsen phase by centuries. These findings position Stonehenge as a further instance of Rios Harmonic Law across the European Neolithic, joining the Carnac Stones (Brittany, France) in demonstrating that the F#6/D#2 frequency pair was encoded in megalithic monuments across the full breadth of Neolithic Europe.