<Christopher Clavius>(1) was a

German Jesuit mathematician and astronomer who

modified the proposal of the modern Gregorian calendar

after the death of its primary author, <Aloysius Lilius>(2). <Clavius>(1) would later write defences and an

explanation of the reformed calendar, including an

emphatic acknowledgement of <Lilio>(2)'s 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>(3).

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(1) owl:sameAs dbr:Christopher_Clavius

(1) foaf:isPrimaryTopicOf wiki:Christopher_Clavius

(2) owl:sameAs dbr:Aloysius_Lilius

(3) foaf:isPrimaryTopicOf wiki:Europe