Honorary Membership was limited to 10 from 1890-1900, and to 15 from 1901 onwards. Corresponding Membership was a lesser class of Honoris causa membership in the early years. A few honorary members, such as Barnard, were first made corresponding members for a short time before being recommissioned as honorary members.
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|Turner, Prof. Herbert Hall||United Kingdom||1916||1930|
|Terby, M. François J.||Belgium||1894||1911|
|Swift, Dr. Lewis A.||USA||1903||1913|
|Struvé, Dr. Otto||USA||1959||1963|
|Strömgren, Prof. Bengt G.||Denmark||1968||1987|
|Stratton, Prof. Frederick John Marrian||United Kingdom||1954||1960|
|Stebbins, Dr. Joel||USA||1958||1966|
|Spencer Jones, Sir Harold||United Kingdom||1947||1960|
|Shklovsky, Dr. Iosif S.||USSR||1966||1984|
|Shearmen, Mr. T.S.H.||Canada||1890||1900|