Answer:
The turning point that is highlighted in the Gregorian calendar is the synchronization of the calendar with the solar year.
Explanation:
The calendar set by Julius Caesar was out of sync with the solar year by 10 days apart. This caused a great deal of confusion, because it caused the seasons to start at different and inaccurate times, which caused great confusion.
To resolve this, Pope Gregory XIII decided to exclude these 10 days from the calendar by synchronizing it with the solar year and making it more accurate, although it is not necessary. With this he managed to establish that the seasons always fall on the same date. The 10 days excluded by him would be compensated with the reorganization of leap years, which would occur every 4 years, but would not happen in centenary years that could not be totally divided by 400 and would result in whole numbers.
