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 | |
|---|---|---|---|
| Vogel, Dr. Hermann C. | Germany | 1894 | 1907 |
| Terby, M. François J. | Belgium | 1894 | 1911 |
| Langley, Dr. Samuel Pierpont | USA | 1894 | 1906 |
| Pickering, Mr. William Henry | USA | 1894 | 1938 |
| Darwin, Dr. Sir George Howard | United Kingdom | 1894 | 1912 |
| Ball, Dr. Sir Robert Stawell | United Kingdom | 1894 | 1913 |
| von Struvé, Dr. Otto Wilhelm | Russia | 1894 | 1899 |
| Rogers, Prof. William A. | USA | 1894 | 1898 |
| McLeod, Dr. Clement Henry | Canada | 1894 | 1917 |
| Pickering, Dr. Edward Charles, OPM | USA | 1894 | 1919 |