Christopher Clavius (25 March 1538 – 6 February 1612) was a German Jesuit mathematician and astronomer who was the main architect of the modern Gregorian calendar. 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 Europe and even in more remote lands (on account of being used by missionaries).
Read more about Christopher Clavius: Early Life, Astronomy
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“Yet, when the walls of flesh grow weak,
In such an hour it may well be,
Through mist and darkness, light will break,
And each anointed sense will see.”
—Ernest Christopher Dowson (1867–1900)