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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|Dollfus, Dr. Audouin C.||France||1975||2011|
|Sandage, Dr. Allan R.||USA||1975||2010|
|Baldwin, Dr. Ralph Belknap||USA||1980||2011|
|Bateson, Dr. Frank M.||New Zealand||1984||2006|
|Brown, Dr. R. Hanbury||United Kingdom/Australia||1987||2002|
|Hogg, Dr. Helen S.||Canada||1987||1993|
|Reber, Mr. Grote||USA/Australia||1988||2002|
|Moore, Sir Patrick||United Kingdom||1993||2013|
|Underhill, Dr. Anne||Canada||1996||2002|
|Robinson, Mr. Leif J.||USA||2000||2011|