| Période | Documents | Annexes | Notices |
|---|---|---|---|
| after 2025 | 4 | 0 | 3 |
| 2015 - 2025 | 9286 | 227 | 9640 |
| 2005 - 2015 | 4299 | 76 | 14848 |
| 1995 - 2005 | 1036 | 3 | 3429 |
| 1985 - 1995 | 133 | 0 | 152 |
| 1975 - 1985 | 41 | 0 | 74 |
| 1965 - 1975 | 4 | 0 | 5 |
| 1955 - 1965 | 1 | 0 | 0 |
| 1945 - 1955 | 1 | 0 | 0 |
| 1935 - 1945 | 0 | 0 | 0 |
| 1925 - 1935 | 0 | 0 | 0 |
| 1915 - 1925 | 0 | 0 | 0 |
| 1905 - 1915 | 0 | 0 | 0 |
| before 1905 | 0 | 0 | 0 |
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Archive ouverte de l'Observatoire de Paris |  |