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Fizeau measured the speed of light in moving water in 1851, obtaining partial ether-drag behavior later explained by relativistic velocity addition.
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Fizeau’s result became an important constraint on ether theories and was naturally recovered by relativistic velocity addition; it was one historical input among several, not a unique origin of special relativity.
The source experiment, observation, anomaly, or problem materially motivated the development, revision, or acceptance of the target concept. Historical influence is not logical derivation; the edge detail states the documented role and avoids retrospective origin myths.
wp-physics-fizeau_moving_water_experimenteinstein-special-relativitytong-relativity