Measurement of the speed of light in L-ARF: Two states yield c

Measurement of the speed of light in L-ARF: Two states yield c In Light - Absolute Reference Framework (L-ARF), time is defined via the light's path, t = s/c, where the origin (emission point) is fixed in vacuum, distinct from the moving source. For an apparatus with mirror separation d moving with absolute velocity v in vacuum, the forward transit time t+ = d/(c-v) and the return time t- = d/(c+v) become different, t+ ≠ t-. The classical definition c_meas ≡ 2d/T measures only the sum T = t+ + t- = Σt and hides the asymmetry. In L-ARF: Σt = t+ + t-, Δt = t+ - t-, v = c·Δt/Σt, c = v·Σt/Δt (theoretical, requires known v). With two states — apparatus at rest relative to an IRF (vr=0, absolute velocity v) and apparatus in motion relative to the IRF (vr>0, absolute velocity v+vr) — the practical formula is derived: c = vr / ( Δtr/Σtr - Δt0/Σt0 ) which requires only the known relative velocity vr. Forward calculations for d=10 m (SI value c=299792458 m/s) show Σt≈66.71 ns is almost constant while Δt is in the ps range: 6.68 ps at 30 km/s (Earth's orbital velocity), 48.96 ps at 220 km/s (solar system around Milky Way), within reach of modern photonics. The ratio Σt/Δt = c/v ≈ 10,000 for 30 km/s explains why classical 2d/T measurements have hidden the asymmetry. A new section analyses Michelson-Morley with two epochs separated by 6 months: v1 = v0 + vorb, v2 = v0 - vorb. Then Δt1/Σt1 - Δt2/Σt2 = 2·vorb/c (first order), while Σt1 - Σt2 ∝ v1² - v2² = 4·v0·vorb (second order, ~19.5 fs for d=10 m vs Δ(Δt)≈13.3 ps). The null result c_meas = const is thus explained, while L-ARF predicts a measurable first-order difference in Δt/Σt. The article contains no reference to or critique of SR; it is purely a metrological proposal for separate measurement of t+ and t-.