page_title: Christopher Clavius
section_title: Selected works
hierarchical_section_title: Christopher Clavius / Selected works
caption_attribution_description: Original image description from the Deutsche FotothekPhilosophie &amp; Mathematik &amp; Jesuiten &amp; Wappen
context_page_description: Christopher Clavius was a Jesuit German mathematician and astronomer who modified the proposal of the modern Gregorian calendar after the death of its primary author, Aloysius Lilius. Clavius would later write defences and an explanation of the reformed calendar, including an emphatic acknowledgement of Lilius' work. In his last years he was probably the most respected astronomer in Europe and his textbooks were used for astronomical education for over fifty years in and even out of Europe.
context_section_description: Novi calendarii romani apologia. Rome, 1588
  Romani calendarii a Gregorio XIII P.M. restituti explicatio. Rome, 1603 (An explanation of the Gregorian calendar)
  Romani calendarii a Gregorio XIII P.M. restituti explicatio. (European Cultural Heritage Online)
  Romani calendarii a Gregorio XIII P.M. restituti explicatio. (University of Notre Dame)
  Commentary on Euclid, 1574
  Elementorum Libri XV. Cologne, 1627 (Published online by the Sächsischen Landesbibliothek - Staats- und Universitätsbibliothek Dresden)
  Treatise of gnomonics, 1581
  Refutatio cyclometriae Iosephi Scaligeri. Mainz, 1609
  Clavius, Christoph (1992). Corrispondenza Edizione critica a cura di Ugo Baldini e Pier Daniele Napolitani. Pisa: Università di Pisa – Dipartimento di Matematica. (Critical edition of his correspondence)
  Clavius' complete mathematical works (5 volumes, Mainz, 1611-1612) are available online .
caption: Refutatio cyclometriae Iosephi Scaligeri
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