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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|Stebbins, Dr. Joel||USA||1958||1966|
|Hertzsprung, Prof. Ejnar||Denmark||1946||1967|
|Shapley, Dr. Harlow||USA||1947||1972|
|Bowen, Dr. Ira S.||USA||1956||1973|
|Joy, Dr. Alfred H.||USA||1961||1973|
|Clemence, Dr. Gerald M.||USA||1964||1974|
|van Biesbroeck, Dr. Georges-Achille||Belgium/USA||1962||1974|
|Plaskett, Prof. Harry H.||Canada/United Kingdom||1961||1979|
|Bok, Dr. Bart J.||Australia||1961||1982|
|Ryle, Sir Martin||United Kingdom||1973||1983|