Regiomontanus

Johannes Müller von Königsberg, better known as Regiomontanus, was a mathematician, astrologer and astronomer of the German Renaissance, active in Vienna, Buda and Nuremberg. His contributions were instrumental in the development of Copernican heliocentrism in the decades following his death.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

SINCOSTAN

Trigonometry that clicks — calculators, identities, and worked explanations for angles and waves.

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