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|
|Joy, Dr. Alfred H.||USA||1961||1973|
|Schwarzschild, Dr. Martin||USA||1963||1999|
|Shapley, Dr. Harlow||USA||1947||1972|
|Struvé, Dr. Otto||USA||1959||1963|
|Adams, Dr. Walter Sydney||USA||1945||1956|
|Stebbins, Dr. Joel||USA||1958||1966|
|Schlesinger, Dr. Frank||USA||1916||1943|
|Burnham, Prof. Sherburne Wesley||USA||1891||1921|
|Campbell, Prof. William Wallace||USA||1905||1938|