Why did the Gregorian calendar replace the Julian calendar?
The Julian calendar was the predecessor of the Gregorian calendar.
The Julian calendar was proposed by Roman consul Julius Caesar, took effect on 1 January 45 BC and was designed with the aid of Greek mathematicians and astronomers such as Sosigenes of Alexandria. It had 365 days divided into 12 months but it did not correctly reflect the actual time it takes the Earth to circle once around the Sun.
In the Julian calendar, a leap day was added every four years, which is too frequent, and progressively important religious holidays were out of sync with the fixed dates for astronomical events.
The introduction of the Gregorian calendar allowed for the realignment with events like equinoxes and solstices.
Because of this error of the Julian calendar, a number of days had to be dropped when the Gregorian calendar was adopted .
The gap between these two calendar systems will increase to 14 days in the year 2100.
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