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- Christian
- below
- civil
- 1583
- ACE
- Western
- system
- Christian calendar
- calendar
- year
- GC
- O.S.
- C.E.
- Greg
- Accuracy
- CE
- N.S.
- NS
- AD
- Year
- Gregorian
- Gregorian reforms
- Julian calendar
- old calendar
- International New Year
- calendars
- B.C.
- months
- New Calendar
- solar calendar
- Gregorian calendar ยง Difference between Gregorian and Julian calendar dates
- ''Gregorian''
- 'Popish' calendar
- (Gregorian)
- (Gregorian) calendar
- (May 11; NS
- (N.S.)
- 2 July
- Calendars
- English calendar
- Greg.
- Gregorian (western) calendar
- Gregorian Calendar
- Gregorian New Year
- Gregorian Style Calendar
- Gregorian Year
- Gregorian calendar Months
- Gregorian calendar reform
- Gregorian calendar seasonal error
- Gregorian calendar system
- Gregorian calendar#Adoption
- Gregorian calendar#Gregorian reform
- Gregorian calendars
- Gregorian century
- Gregorian civil calendar
- Gregorian date
- Gregorian dates
- Gregorian dating
- Gregorian day
- Gregorian month
- Gregorian months
- Gregorian one
- Gregorian order
- Gregorian reform
- Gregorian reform of the calendar
- Gregorian reformation of the calendar
- Gregorian style
- Gregorian system
- Gregorian year
- Gregorian<br>calendar
- Gregorian_calendar#Gregorian_reform
- January 8, 1917
- N. S.
- N.S
- New (Gregorian) Calendar
- New Style calendar
- Reformed the calendar
- The Gregorian calendar
- Western Calendar
- Western Christian calendar
- Western European Calendar
- Western calculation
- Western calendar
- Western calendar dates
- Western calendars
- Year 1582 problem
- a new style
- adoption of the Gregorian calendar
- beginning of the year
- calendar months
- calendar of the Western World
- calendar reform
- calendar reform, commissioned by Pope Gregory XIII
- calendar year
- calendarii Gregoriani
- common modern calendar
- common solar year
- computed time slippage
- datekeeping system
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