Clavius, Christopher

Christopher Clavius ( Latin Christophorus Clavius ; March 25, 1538 , Bamberg - February 6, 1612 , Rome ) - German mathematician and astronomer . Member of the Order of the Jesuits. He became famous for his participation in the calendar reform commission created by Pope Gregory XIII ; essentially is the author of the Gregorian calendar

Clavius
Christophorus clavius
Date of Birth	March 25, 1538 ( 1538-03-25 )
Place of Birth	Bamberg
Date of death	February 6, 1612 ( 1612-02-06 ) (73 years old)
Place of death	Rome
A country
Scientific field
Alma mater

He was entrusted by Pope Gregory XIII with the conversion of the calendar . The reason for the reform was the shift of the actual day of the vernal equinox to March 10, while Easter promised to take March 21 from the Julian calendar into account.

Of his works, the most interesting are:

• "Euclidis elementorum libri XVI cum scholiis" ( 1574 );
• Gnomonices libri VIII ( 1581 );
• "Calendarii romani gregoriani explicatio jussu Clementis VIII" ( 1603 );
• "Computus ecclesiasticus per digitorum articulos et tabulas traditus" ( 1603 ).

His name is given to the third largest crater on the visible side of the moon.