Thomas Clausen | |
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| Born | 16 January 1801 |
| Died | 23 May 1885 (aged 84) |
| Known for | Clausen function, Clausen's formula |
Thomas Clausen (16 January 1801, Snogbæk, Sottrup Municipality, Duchy of Schleswig – 23 May 1885, Tartu, Imperial Russia) was a Danish mathematician and astronomer.