The Julian calendar, introduced by Julius Caesar in 45 BC, had been in use for over a millennium. However, it miscalculated the solar year by about 11 minutes per year. Over centuries, these minutes added up, causing significant drift from the astronomical seasons. By the 16th century, the error amounted to approximately 10 days. To realign the calendar with the solar year and fix the date of Easter, Pope Gregory XIII decreed a switch to a new calendar system, now known as the Gregorian calendar
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The Julian calendar, introduced by Julius Caesar in 45 BC, had been in use for over a millennium. However, it miscalculated the solar year by about 11 minutes per year. Over centuries, these minutes added up, causing significant drift from the astronomical seasons. By the 16th century, the error amounted to approximately 10 days. To realign the calendar with the solar year and fix the date of Easter, Pope Gregory XIII decreed a switch to a new calendar system, now known as the Gregorian calendar
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