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.
Nation(s) |
Start | End | |
|---|---|---|---|
| Gore, Mr. John Ellard | Ireland | 1891 | 1910 |
| Hirayama, Prof. Kiyotsugu | Japan | 1907 | 1943 |
| Gonzalez de León, Sr. Luis | Mexico | 1903 | 1914 |
| Oort, Dr. Jan Hendrik | Netherlands | 1954 | 1992 |
| van de Hulst, Prof. Hendrik | Netherlands | 1968 | 2000 |
| Bateson, Dr. Frank M. | New Zealand | 1984 | 2006 |
| Iwanowska, Dr. Wilhelmina | Poland | 1973 | 1999 |
| von Struvé, Dr. Otto Wilhelm | Russia | 1894 | 1899 |
| Lindblad, Dr. Bertil | Sweden | 1956 | 1965 |
| Backlund, Dr. Oskar | Sweden/Russia | 1916 | 1916 |