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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|Iwanowska, Dr. Wilhelmina||Poland||1973||1999|
|Schwarzschild, Dr. Martin||USA||1963||1999|
|Ambartsumian, Dr. Viktor Amazaspovitch||USSR/Armenia||1959||1996|
|Unsöld, Dr. Albrecht||Germany||1956||1995|
|Hogg, Dr. Helen S.||Canada||1987||1993|
|Oort, Dr. Jan Hendrik||Netherlands||1954||1992|
|Goldberg, Dr. Leo||USA||1974||1988|
|Strömgren, Prof. Bengt G.||Denmark||1968||1987|
|Woolley, Dr. Richard v.d.R.||United Kingdom/South Africa||1961||1986|
|Shklovsky, Dr. Iosif S.||USSR||1966||1984|