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 |
| Kedzie, Mr. John Hume | USA | 1890 | 1903 |
| Langley, Dr. Samuel Pierpont | USA | 1894 | 1906 |
| Brashear, Dr. John A. | USA | 1901 | 1920 |
| Hale, Dr. George Ellery | USA | 1900 | 1938 |
| Schwarzschild, Dr. Martin | USA | 1963 | 1999 |
| Russell, Prof. Henry Norris | USA | 1946 | 1957 |
| Shoemaker, Carolyn | USA | 2003 | 2021 |
| Baldwin, Dr. Ralph Belknap | USA | 1980 | 2011 |
| Campbell, Prof. William Wallace | USA | 1905 | 1938 |