Who advised Pope Gregory XIII on the calendar reform?
Aloysius Lilius
Galileo Galilei
Nicolaus Copernicus
Johannes Kepler
Answer
Aloysius Lilius, an Italian physician and astronomer, advised Pope Gregory XIII on the calendar reform. Lilius proposed a calendar that would correct the accumulated error in the Julian calendar, which had caused the spring equinox to drift away from its original date. The Gregorian calendar, which was implemented in 1582, adopted Lilius's proposal and remains the international civil calendar today.
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