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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|Woolley, Dr. Richard v.d.R.||United Kingdom/South Africa||1961||1986|
|Baldwin, Dr. Ralph Belknap||USA||1980||2011|
|Robinson, Mr. Leif J.||USA||2000||2011|
|Sandage, Dr. Allan R.||USA||1975||2010|
|Bowen, Dr. Ira S.||USA||1956||1973|
|Clemence, Dr. Gerald M.||USA||1964||1974|
|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|