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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|Hubble, Dr. Edwin Powell||USA||1951||1953|
|Adams, Dr. Walter Sydney||USA||1945||1956|
|Russell, Prof. Henry Norris||USA||1946||1957|
|Proctor, Miss Mary||USA||1896||1957|
|Baade, Dr. Wilhelm Heinrich Walter||Germany||1954||1960|
|Spencer Jones, Sir Harold||United Kingdom||1947||1960|
|Stratton, Prof. Frederick John Marrian||United Kingdom||1954||1960|
|Mitchell, Prof. Samuel||Canada/USA||1958||1960|
|Struvé, Dr. Otto||USA||1959||1963|
|Lindblad, Dr. Bertil||Sweden||1956||1965|