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In page Aberration (astronomy):

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Bradley eventually developed his explanation of aberration in about September 1728 and this theory was presented to the Royal Society in mid-January the following year. It has been suggested that he was inspired by seeing the change of direction of a wind vane on a boat on the Thames, caused not by an alteration of the wind itself, but by a change of course of the boat relative to the wind direction.[1] However, there is no record of this incident in Bradley's own account of the discovery, and it may therefore be apocryphal.[citation needed]