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 | |
|---|---|---|---|
| Kirkwood, Dr. Daniel | USA | 1890 | 1895 |
| Shapley, Dr. Harlow | USA | 1947 | 1972 |
| Newcomb, Rear Admiral Dr. Simon | USA | 1891 | 1909 |
| Barnard, Dr. Edward Emerson | USA | 1901 | 1923 |
| Struvé, Dr. Otto | USA | 1959 | 1963 |
| Robinson, Mr. Leif J. | USA | 2000 | 2011 |
| Stebbins, Dr. Joel | USA | 1958 | 1966 |
| Lowell, Prof. Percival Lawrence | USA | 1916 | 1916 |
| Adams, Dr. Walter Sydney | USA | 1945 | 1956 |
| Schlesinger, Dr. Frank | USA | 1916 | 1943 |