“Book 1 deals with logistic numbers, {{w|prosthaphaeresis}} and the calculation of sines. “Logistic numbers” are the {{w|sexagesimal}} numbers... used for astronomical calculations. ...Bürgi explains the four basic operations of arithmetic and the extraction of roots. ...The topic of Chapter 3 is {{w|prosthaphaeresis}}. ...The remaining 10 chapters ...are on sines and ...calculation of sine values. Chapters 11 and 12... explains here in detail his own method for computing... all sine values from 0 to 90 degrees... The result is a sine table for every minute with 5-7 {{w|sexagesimal}} places.”

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About Jost Bürgi

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