EUCLIDIS ELEMENTORUM LIBRI XV. ACCESSIT PER XVI. DE SOLIDORUM REGULARIBUS CUIUSLIBET INTRA QUODLIBET COMPARATIONE […] [AND] EUCLIDIS POSTERIORES LIBRI IX. […].
by Christophor Clavius
Frankfurt ; 1654
2 works in 1 volume
Size 4 1/2 by 7 3/4"
3" thick
[120]-671, 680 pp.
Frankfurt edition of the monumental annotated Latin translation of Euclid by the Jesuit Christophor Clavius (1538-1612).
Numerous woodcut diagrams in-text.
Woodcut mark on title.
Original vellum binding. Some foxing, bookblock loosening from spine at the front
- ref. DBS II:1214:2. - VD17 23:324619V & 23:324624P.
Provenance: Ownership cut out on title.
Text in Latin

Christopher Clavius, SJ (1538 – 1612) was a Jesuit German mathematician, head of mathematicians at the Collegio Romano, and astronomer who was a member of the Vatican commission that accepted the proposed calendar invented by Aloysius Lilius, that is known as Gregorian calendar.
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.



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