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Naturevolume 119page259 (1927) | Download Citation



February 14, 1748.—The two great discoveries of Bradley were those of aberration and nutation. Both resulted from his attempt to determine the parallax of the stars. Aberration was discovered in 1727; he recognised nutation twenty years later, his discovery being made known in a letter dated Feb. 14, 1748, addressed to the Earl of Macclesfield. Bradley at that time was Astronomer-Royal, having succeeded Halley in 1742.


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