Prosthaphaeresis revisited. (English) Zbl 0641.01002

Dealing with the trigonometric identities for the product of two sines and the product of two cosines the author argues that the former equation was discovered by Johannes Werner aroung 1510 and the latter by Joost Bürgi around 1585. The method of prosthaphairesis, however, concerned with simplifying calculation by means of these equations, was developed by Paul Wittich of Breslau and, in 1580, communicated by him to Tycho Brahe at Hven where it became part of the calculational routine used for the reduction of observational data.
Reviewer: Kr. P. Moesgaard


01A40 History of mathematics in the 15th and 16th centuries, Renaissance
85-03 History of astronomy and astrophysics
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