Sir Arthur Eddington, O.M., F.R.S

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THROUGHOUT his career as an astronomer, Sir Arthur Eddington's connexion with the Royal Astronomical Society, both formal and scientific, was close and intimate. He was elected a fellow in 1906, was president during 1921–23 (a period of office which included the celebration Of the centenary of the Society), received its Gold Medal in 1924, and after H. H. Turner's death eventually inherited his office as foreign secretary, his corner-seat in the front row at meetings and, it is fair to add, his place in the affections of the fellows. He used its Monthly Notices as the medium of publication for almost all his fundamental contributions to science. Thus his early papers on star-streaming appeared there; his initial papers on Cepheid pulsations in 1916 appeared there; and these led in turn to his beautiful theory of the radiative equilibrium of the stars, in which the flow of radiation was first recognized as a basic process in the transfer of energy in stellar interiors, and in which the mechanical pressure of radiation was first shown to be an important element in the mechanical equilibrium.

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