Saturday, November 26, 2011

Christopher Clavius's Opera Mathematica

Christopher Clavius S. J. (1537 - 1612) was a German mathematician and astronomer. Renowned as a teacher and writer of textbooks, Clavius was particularly active in the reform of the Gregorian calendar. This is the title page of his collected works, Opera Mathematica, (1612), five volumes.

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