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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|Joy, Dr. Alfred H.||USA||1961||1973|
|Plaskett, Prof. Harry H.||Canada/United Kingdom||1961||1979|
|Woolley, Dr. Richard v.d.R.||United Kingdom/South Africa||1961||1986|
|Ambartsumian, Dr. Viktor Amazaspovitch||USSR/Armenia||1959||1996|
|Struvé, Dr. Otto||USA||1959||1963|
|Stebbins, Dr. Joel||USA||1958||1966|
|Mitchell, Prof. Samuel||Canada/USA||1958||1960|
|Bowen, Dr. Ira S.||USA||1956||1973|
|Lindblad, Dr. Bertil||Sweden||1956||1965|
|Unsöld, Dr. Albrecht||Germany||1956||1995|