Podcast
Questions and Answers
How many years out of the 400-year cycle are leap years?
How many years out of the 400-year cycle are leap years?
What was the motivation for the Gregorian calendar reform?
What was the motivation for the Gregorian calendar reform?
Who instituted the Gregorian calendar reform?
Who instituted the Gregorian calendar reform?
What was the error in the Julian calendar that led to the Gregorian calendar reform?
What was the error in the Julian calendar that led to the Gregorian calendar reform?
Signup and view all the answers
Who estimated the accumulated error of the Julian calendar to be seven or eight days in the 13th century?
Who estimated the accumulated error of the Julian calendar to be seven or eight days in the 13th century?
Signup and view all the answers
Which council recommended that all Christians should celebrate Easter on the same day?
Which council recommended that all Christians should celebrate Easter on the same day?
Signup and view all the answers
Who was invited to the Vatican by Pope Sixtus IV to undertake a calendar reform in 1475?
Who was invited to the Vatican by Pope Sixtus IV to undertake a calendar reform in 1475?
Signup and view all the answers
According to the Gregorian calendar, which years are leap years?
According to the Gregorian calendar, which years are leap years?
Signup and view all the answers
What was the main reason for establishing the Gregorian calendar?
What was the main reason for establishing the Gregorian calendar?
Signup and view all the answers
What was the Julian calendar's assumption about the average solar year?
What was the Julian calendar's assumption about the average solar year?
Signup and view all the answers
What was the effect of the Gregorian reform on the calendar year length?
What was the effect of the Gregorian reform on the calendar year length?
Signup and view all the answers
What was the problem with the Julian calendar's leap year algorithm?
What was the problem with the Julian calendar's leap year algorithm?
Signup and view all the answers
What was the date when the Gregorian calendar was introduced by Pope Gregory XIII?
What was the date when the Gregorian calendar was introduced by Pope Gregory XIII?
Signup and view all the answers
What was the problem caused by the Julian calendar's excess leap days?
What was the problem caused by the Julian calendar's excess leap days?
Signup and view all the answers
Which council authorised Pope Paul III to reform the calendar?
Which council authorised Pope Paul III to reform the calendar?
Signup and view all the answers
Who believed that Easter should be computed from the true motions of the Sun and Moon?
Who believed that Easter should be computed from the true motions of the Sun and Moon?
Signup and view all the answers
What was the modification made by Aloysius Lilius to the leap year system?
What was the modification made by Aloysius Lilius to the leap year system?
Signup and view all the answers
What was the long-standing obstacle to calendar reform that Aloysius Lilius solved?
What was the long-standing obstacle to calendar reform that Aloysius Lilius solved?
Signup and view all the answers
Who noted discrepancies in the ancient tables provided for the Sun's mean longitude?
Who noted discrepancies in the ancient tables provided for the Sun's mean longitude?
Signup and view all the answers
What was the Gregorian leap year rule proposed by Petrus Pitatus of Verona?
What was the Gregorian leap year rule proposed by Petrus Pitatus of Verona?
Signup and view all the answers
What is the mean length of the Gregorian year according to the Babylonian sexagesimals?
What is the mean length of the Gregorian year according to the Babylonian sexagesimals?
Signup and view all the answers
What was the commonly used value for the mean tropical year in Lilius's time?
What was the commonly used value for the mean tropical year in Lilius's time?
Signup and view all the answers
What was the proposal made by Giambattista Benedetti and Giuseppe Moleto that was not adopted?
What was the proposal made by Giambattista Benedetti and Giuseppe Moleto that was not adopted?
Signup and view all the answers
Which calendar did the Gregorian reform replace?
Which calendar did the Gregorian reform replace?
Signup and view all the answers
What was the reason for advancing the date by 10 days during the Gregorian reform?
What was the reason for advancing the date by 10 days during the Gregorian reform?
Signup and view all the answers
Which countries were the first to adopt the Gregorian calendar?
Which countries were the first to adopt the Gregorian calendar?
Signup and view all the answers
What is the difference between the Julian and Gregorian calendars?
What is the difference between the Julian and Gregorian calendars?
Signup and view all the answers
Which country was the last European country to adopt the Gregorian calendar for civil use?
Which country was the last European country to adopt the Gregorian calendar for civil use?
Signup and view all the answers
What is the significance of the year 1582 in relation to the Gregorian reform?
What is the significance of the year 1582 in relation to the Gregorian reform?
Signup and view all the answers
Do all Orthodox churches use the Julian calendar for religious rites?
Do all Orthodox churches use the Julian calendar for religious rites?
Signup and view all the answers
