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2019-11-06 09:29:46
URSINUS, Benjamin.
Cursus Mathematici Practici Volumen Primum [all published]: continens Illustr. & Generosi Dn. Dn. Johannis Neperi Baronis Merchistonii &c. Scoti. Trigonometriam Logarithmicam.
Cölln an der Spree: Martin Guthius, 1618. First edition, exceptionally rare, of the book that introduced logarithms to Continental Europe; in particular, it was through this work that Johannes Kepler, in 'a happy calamity,' as he called it, became aware of Napier's epoch-making work, a discovery that enabled him to complete his great Rudolphine Tables (1627), "the foundation of all planetary calculations for over a century" (Sparrow). "The earliest publication of Napier's logarithms on the Continent was in 1618, when Benjamin Ursinus included an excerpt from the canon, shortened by two places, in his Cursus mathematici practici. Through this work Kepler became aware of the importance of Napier's discovery and expressed his enthusiasm in a letter to Napier dated 28 July 1619, printed in the dedication of his Ephemerides (1620)" (DSB, under Napier). Ursinus assisted Kepler with the computations for the Rudolphine Tables, and Kepler presented and inscribed a copy to Ursinus (Honeyman 1800 - this copy is now held by the Adler Planetarium in Chicago); in the inscription, Kepler calls Ursinus and Tycho Brahe the scientific fathers of the tables. "The [Rudolphine] Tables was far more accurate than its predecessors - its margin of error staying within 10 seconds compared to up to 5 degrees with earlier tables. Instead of providing a sequence of planetary positions for specified days (which Kepler did in his Ephemerides), the Rudolphine Tables were set up to allow calculations of planetary positions for any time in the past or future. The finding of the longitude of a given planet a … [Click Below for Full Description]
Bookseller: SOPHIA RARE BOOKS [Denmark]

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