Aloysius Lilius
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Aloysius Lilius, also variously referred to as Luigi Lilio or Luigi Giglio, was an Italian physician, astronomer, philosopher and chronologist, and also the "primary author" who provided the proposal
Bust of Aloysius Lilius
Inter gravissimas
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Inter gravissimas was a papal bull issued by Pope Gregory XIII on 24 February 1582. The document, written in Latin, reformed the Julian calendar. The reform has conventionally come to be regarded as a
Aloysius Lilius
…shows the new moon and so can be easily adapted to any length of the year, if only at the right moments the due adjustment is applied." The papal bull (Inter gravissimas) was issued on 24 February 1582 (year 1581 in Florentine Easter-based reckoning), ordering Catholic clergy to adopt the new calendar, and exhorting all…
The first page of the papal bull Inter Gravissimas