Coupling Constants as Observer Position on a Z₃ Strip

Three independently measured quantities — the fine structure constant (α ≈ 1/137), the Weinberg angle (sin²θ_W ≈ 0.223), and the baryonic fraction (Ω_b ≈ 0.049) — are shown to correspond to a single geometric displacement on a Z₃ (one-third-twist) strip. The hexagonal cross-section of the strip places the observer at the anti-gravity node, offset by δ = 2.00° ± 0.02°. Given any one of the three measurements and the Z₃ accumulation rule (weak tilt = 3 × offset), the other two are predicted within 0.3% with zero adjustable parameters. An exact algebraic identity proves that gravity equals the electromagnetic–weak amplitude asymmetry. The Standard Model treats these as three independent free parameters; this geometry reduces them to one: the observer's position.