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On the basis of Galilean invariance and the Doppler formula, combined with anobservational condition, it is shown that the constancy of the velocity oflight {\it in vacuo} can be derived, together with time-dilatation and Lorentzcontraction. It is not necessary to take the constancy as a postulate.Comment: 5 pages AIP-tex. Conference "Quantum Theory: Reconsideration of  Foundations 3", Vaxjo Sweden, June 2005. To appear in AIP conference serie

Observational Derivation of Einstein’s “Law of the Constancy of the Velocity of Light in Vacuo”