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A Proposal of a Method for Finding the Longitude at Sea within a Degree, or Twenty Leagues. By Dr. Edmund Halley, Astr. Reg. Vice-President of the Royal Society. With an Account of the Progress He Hath Made Therein, by a Continued Series of Accurate Observations of the Moon, Taken by Himself at the Royal Observatory at Greenwich

Edmund Halley
1731 Philosophical Transactions