03054nam a22004213i 4500 22055780 20250607105717.8 m |o d | cr ||||||||||| 210507s1623 it |||||o|||||||| ||ita 22055780 0 ibc orignew u ncip 20 y-gencatlg LCAP batch update 2025-06-02-04:00: LCAPM-988 2021666740 (WDL)04184 DLC eng DLC ita 523 Works of Galileo Galilei, Part 3, Volume 15, Astronomy: The Assayer. Il Saggiatore Rome : Giacomo Mascardi, 1623. 1 online resource. text txt rdacontent computer c rdamedia online resource cr rdacarrier Title devised, in English, by Library staff. Il saggiatore (The assayer) by Galileo Galilei (1564--1642) is the final and most significant work in the polemic regarding the characteristics of comets involving the Italian scientist and mathematician in the years 1618--23. Three comets appeared in the skies over Europe in 1618, giving rise to a debate about the nature of these celestial bodies. In 1619 Jesuit priest Orazio Grassi published a pseudonymous treatise on the comets. Grassi's interpretation was then criticized in Discorso delle comete (Discourse on comets), a work published by Mario Guiducci but attributed to Galileo. Il saggiatore is addressed to Virginio Cesarini, a young man who had heard Galileo lecture in Rome. Taking Grassi's polemic on the nature of celestial bodies as a point of departure, Galileo set forth a general scientific approach to the investigation of celestial phenomena, thereby making an indirect defense of the Copernican, heliocentric, theory against the Ptolemaic, geocentric, system. Galileo argued that the book of nature was written in mathematical terms and so could only be deciphered by those who knew mathematics. Il saggiatore was published in Rome in 1623 under the auspices of the Lincean Academy, and dedicated to Pope Urban VIII. The Roman edition was entrusted to Tommaso Stigliani, who did a poor job resulting in numerous typographical errors. All of the copies of the first edition of Il saggiatore thus bear corrections needed to give the text of Galileo's original meaning. This copy shows marginal notes in Galileo's own hand. Original resource at: National Central Library of Florence. Content in Italian. Description based on data extracted from World Digital Library, which may be extracted from partner institutions. 1618 to 1623 Celestial bodies Comets Galilei, Galileo, 1564-1642 Heliocentric astronomy Solar system Galilei, Galileo, 1564-1642 Author. Italy Galilean Collection gdcwdl wdl_04184 https://hdl.loc.gov/loc.wdl/wdl.4184 wdl/wdlpartner/wdlflorence s-Online Electronic Resource