n the United States and systematically only errors 26 seconds per solar year a deficient of one day every 3323 years.
             The wise and practical change by pope Charles was uninformed by many and ignored by some and protestant from those that wanted no change. And change for some was as late in 1918, Russia converted after there revolutionary war , Greece finally change in 1923.In contrast still many orthodox churches follow the Julian calendar to the day. Mean while the Julian calendar has a deficient of 13 days to date by the Gregorian calendar.
             Since their invention calendars have been used to reckon time in
             advance and to fix the occurrence of events like harvest or religious
             festivals. Ancient people tied their calendars to what ever recurring
             natural phenomena the could most easily observe. In areas with
             pronounced seasons, annual weather changes usually fixed the
             calendar; in warmer climates such as southern Europe, Africa and
             Middle East, the moon was used to mark time.
             ...