Aloysius Lilius

Who was Aloysius Lilius?

Aloysius Lilius, also variously referred to as Luigi Lilio, Luigi Giglio, was an Italian doctor, astronomer, philosopher and chronologist, and also the "primary author" who provided the proposal that became the basis of the Gregorian Calendar reform of 1582.

The crater Lilius on the Moon is named after him, as is the asteroid 2346 Lilio. In computer science, the Lilian date is the number of days since adoption of the Gregorian Calendar, on 15 October 1582.