music. It is from Breslau that Moretus sent the Tractatus physico-mathematicus de aestu mari (Physio-mathematical Treatise of the Tides), one of his best-known works, to Antwerp for publication. In this work he explains the tides as a result of the magnetism of the moon. Moretus died in Breslau (Wroclaw). The lunar crater Moretus was named after him. Work The scientific work undertaken by Moretus was very successful: he made various discoveries in physics and astronomy, hydraulics and music theory but mainly mathematics. His research in optics brought him even fame among such scientists as was Robert Hooke, Athanasius Kircher, Cornelis Drebbel and Jan Marek Marci. Moretus' scientific diaries containing technical notes and drafts as well as his correspondence with eminent European scholars of that time such as Athanasius Kircher, Balthasar Conrad, Giovanni Battista Riccioli are preserved in the National Library of the Czech Republic. His extensive correspondence with his family members Balthasar Moretus I and Balthasar Moretus II who had taken over management of the Plantin Press is partially preserved in the Plantin-Moretus Museum in Antwerp. Selected works Relating to mathematics Mathematici Tractatus, Prague, 1641 Propositiones mathematicae ex Optica de Imagine Visionis, Bratislava, 1661 Propositiones mathematicas ex harmonica de Soni Magnitude, 1664 Relating to geometrics De luna pascali et solis motu, Wroclaw, 1666 Relating to physics De ponderum gravitate, Prague, 1663 Tractatus physico-mathematicus de aestu mari, Antwerp, Jac. Meursius, 1665 Relating to theology Soliloquia ad obtestationes Davidicas et Psalmorum allegoria, Antwerp, Plantin Press, 1656 De principatu B. Virginis, Antwerp, Plantin Press, 1670 Principatus incomparabilis primi filii hominis messiae et primae parentis Matris Virginis : in conceptione illius immaculata exhibitus, Cologne, Apud viduam J. Busaei, 1671 References External links Tractatus physico-mathematicus de aestu mari,, Antwerp, Jac. Meursius, 1665. Full text at Google books Soliloquia ad obtestationes Davidicas et Psalmorum allegoria, Antwerp, Plantin Press, 1656. Full text at Google books Principatus incomparabilis primi filii hominis messiae et primae parentis Matris Virginis : in conceptione illius immaculata exhibitus, Cologne, Apud viduam J. Busaei, 1671. Full text at Google books 1602 births 1667 deaths Mathematicians of the Spanish Netherlands Flemish academics Flemish Jesuits Jesuit scientists