A precision long-arm scanning Michelson interferometer system is described that is capable of measuring absolute laser wavelength to within several parts in 10⁹ in the 10-µm spectral range and to within several parts in 10¹¹ in the visible range. The R(14) line of the CO₂ 9.4-µm band is measured to be 9.305 385 613 (70) µm. This measured value and the known frequency of this line give a value for the speed of light: c = 299 792 457.6 (2.2) m/sec, in agreement with the recent independent measurements of c and its recommended value.

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