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 | |
|---|---|---|---|
| Ambartsumian, Dr. Viktor Amazaspovitch | USSR/Armenia | 1959 | 1996 |
| Shklovsky, Dr. Iosif S. | USSR | 1966 | 1984 |
| Proctor, Mrs. Richard A. | USA/Ireland | 1891 | 1896 |
| Winder, Mr. Daniel K. | USA/Canada | 1890 | 1891 |
| Reber, Mr. Grote | USA/Australia | 1988 | 2002 |
| Hubble, Dr. Edwin Powell | USA | 1951 | 1953 |
| Swift, Dr. Lewis A. | USA | 1903 | 1913 |
| Pickering, Mr. William Henry | USA | 1894 | 1938 |
| Rogers, Prof. William A. | USA | 1894 | 1898 |
| Kedzie, Mr. John Hume | USA | 1890 | 1903 |