Thomas Fincke

Thomas Fincke (6 January 1561 – 24 April 1656) was a Danish mathematician and physicist, and a professor at the University of Copenhagen for more than 60 years.

Fincke's lasting achievement is found in his book Geometria rotundi (1583), in which he introduced the modern names of the trigonometric functions tangent and secant.

His daughters married scientist Caspar Bartholin the Elder (1585–1629), botanist Jørgen Fuiren (1581–1628), historian Ole Worm (1588–1654) and theologian Hans Brochmand (1594–1630).

[2] [3][4] Fincke died at Copenhagen and was buried at Vor Frue Kirke.

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