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 | |
|---|---|---|---|
| Adams, Dr. Walter Sydney | USA | 1945 | 1956 |
| Schlesinger, Dr. Frank | USA | 1916 | 1943 |
| Burnham, Prof. Sherburne Wesley | USA | 1891 | 1921 |
| Barnard, Dr. Edward Emerson | USA | 1901 | 1923 |
| Newcomb, Rear Admiral Dr. Simon | USA | 1891 | 1909 |
| Shapley, Dr. Harlow | USA | 1947 | 1972 |
| Kirkwood, Dr. Daniel | USA | 1890 | 1895 |
| Langley, Dr. Samuel Pierpont | USA | 1894 | 1906 |
| Brashear, Dr. John A. | USA | 1901 | 1920 |
| Russell, Prof. Henry Norris | USA | 1946 | 1957 |