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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|Oort, Dr. Jan Hendrik||Netherlands||1954||1992|
|Baade, Dr. Wilhelm Heinrich Walter||Germany||1954||1960|
|Stratton, Prof. Frederick John Marrian||United Kingdom||1954||1960|
|Hubble, Dr. Edwin Powell||USA||1951||1953|
|Shapley, Dr. Harlow||USA||1947||1972|
|Spencer Jones, Sir Harold||United Kingdom||1947||1960|
|Hertzsprung, Prof. Ejnar||Denmark||1946||1967|
|Russell, Prof. Henry Norris||USA||1946||1957|
|Adams, Dr. Walter Sydney||USA||1945||1956|
|Bruce, Mr. William||Canada||1927||1927|