I want to know the answer to the following question:
With what other difference did the Gregorian calendar concern itself?
All the background I'm provided with is that "In addition to the change in the mean length of the calendar year from 365.25 days (365 days 6 hours) to 365.2425 days (365 days 5 hours 49 minutes 12 seconds), a reduction of 10 minutes 48 seconds per year, the Gregorian calendar reform also dealt with the accumulated difference between these lengths.". Is that enough to answer the question?