"In 1616 Kepler wrote a work on mensuration in which he distinctly took up the decimal fraction, using both a decimal point (comma) and the parentheses to separate the fractional part. He stated it as his opinion that these fractions were due to Bürgi, although it seems strange that he was not familiar with the work of Stevin."
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Ref: Johannes Kepler, Ausszug auss der uralten Messe-Kunst Archimedis (1616). It appears in Vol. V, Frisch edition of Kepler’s works, 1864. Quote: "Dise Art der Bruchrechnung ist von Jost Bürgen zu der sinusrechnung erdacht." or "This type of fraction calculation was invented by Jost Bürgen for the sine calculation."
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Jost Bürgi
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