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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|Goldberg, Dr. Leo||USA||1974||1988|
|Iwanowska, Dr. Wilhelmina||Poland||1973||1999|
|Ryle, Sir Martin||United Kingdom||1973||1983|
|Strömgren, Prof. Bengt G.||Denmark||1968||1987|
|van de Hulst, Prof. Hendrik||Netherlands||1968||2000|
|Shklovsky, Dr. Iosif S.||USSR||1966||1984|
|Clemence, Dr. Gerald M.||USA||1964||1974|
|Schwarzschild, Dr. Martin||USA||1963||1999|
|van Biesbroeck, Dr. Georges-Achille||Belgium/USA||1962||1974|
|Bok, Dr. Bart J.||Australia||1961||1982|