Bartholomaeus Pitiscus

Pitiscus supported Frederick's subsequent measures against the Roman Catholic Church.

Pitiscus achieved fame with his influential work, Trigonometria: sive de solutione triangulorum tractatus brevis et perspicuus (Trigonometry: A short and clear treatise on the solution of triangles) which was printed as an appendix to work of Abraham Scultetus Sphæricorum libri tres methodice conscripti & utilibus scholiis expositi.

This introduced the word trigonometry to the English and French languages, translations into which had appeared in 1614 and 1619, respectively.

A standalone edition called Trigonometriæ sive de dimensione triangulorum libri quinque (Five books on trigonometry or the dimensions of triangles) was published in 1608 which included trigonometric tables with another, improved, edition being published in 1612.

The decimal place was later used in its modern context by John Napier in Mirifici Logarithmorum Canonis Descriptio.