'Paul Guldin' (original name 'Habakkuk Guldin') (June 12, 1577 - November 3, 1643) was a Swiss mathematician and astronomer. He discovered the Guldinus theorem to determine the surface and the volume of a solid of revolution. This theorem is also known as Pappus-Guldinus theorem and Pappus's centroid theorem, attributing Pappus of Alexandria.
He was born in St. Gallen, Switzerland and was a professor of mathematics in Graz and Vienna.
In Paolo Casati's astronomical work ''Terra machinis mota'' (1658), Casati imagines a dialogue between Guildin, Galileo, and Marin Mersenne on various intellectual problems of cosmology, geography, astronomy and geodesy.

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