Friedrich Tietjen (1834, Westerstede, Oldenburg – 1895) was a German astronomer.
He was director of the Astronomisches Rechen-Institut (ARI) from 1874 until his death in 1895.
| 86 Semele | January 4, 1866 |
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| Name | Tietjen, Friedrich |
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| Short description | German astronomer |
| Date of birth | 1834 |
| Place of birth | |
| Date of death | 1895 |
| Place of death | |