Linked from

The 91 pages that link to Gregorian calendar, each with the reason it gives.

• Julian calendarCompared with: It corrected the seasonal drift inherited from the Julian calendar.

• Japanese era nameCompared with: It numbers years continuously rather than restarting at each Japanese era.

• Japanese calendarRelated: It supplies Japan’s current civil year, month, and date.

• Islamic calendarCompared with: Its solar years contrast with the Islamic calendar’s shorter lunar years.

• Lunar calendarBroader topic: Its fixed seasonal structure contrasts with dates that follow lunar months.

• Hebrew calendarCompared with: It tracks the solar year directly rather than coordinating lunar months with it.

• Tropical yearRelated: Its average year closely approximates the tropical year.

• Chinese calendarCompared with: It counts solar years without basing months on lunar phases.

• EquinoxRelated: Its leap-year rules keep calendar dates aligned with the seasonal year and equinoxes.

• Roman CalendarCompared with: Its leap-year rule corrected a seasonal error inherited from the Julian reform.

• IntercalationBroader topic: Its leap-year rule is a familiar day-based intercalation system.

• Leap yearNarrower topic: Its 400-year rule determines which years gain February 29.

• CalendarBroader topic: Its century-year exceptions limit the drift inherited from the Julian calendar.

• Lunisolar calendarBroader topic: It illustrates a solar solution to seasonal drift that does not add lunar months.

• Anno DominiRelated: It is the calendar most commonly paired with Anno Domini year numbers today.

• Pope Gregory XIIIBroader topic: Gregory’s most enduring reform replaced the Julian calendar across much of the world.

• Synodic monthCompared with: The civil West abandoned lunar month-counting, though Easter computation kept it.

• ISO 8601Related: ISO 8601 date forms commonly express dates in this calendar.

• NengōCompared with: It numbers years continuously, while nengō restart their count at each era change.

• Calendar reformBroader topic: Its adoption is the best-known correction of accumulated calendar drift.

• EasterRelated: Most Western churches calculate Easter using this calendar’s solar dates.

• French Republican calendarCompared with: Its restoration replaced the Republican calendar’s months and dating conventions.

• SolsticeRelated: Its leap-year rules keep calendar dates near the solstices aligned with the seasons.

• Buddhist calendarCompared with: Its fixed solar year contrasts with Buddhist lunar observance dates.

• Japanese lunisolar calendarCompared with: It became Japan's official civil calendar in place of lunisolar reckoning.

• Common EraRelated: Common Era labels are commonly applied to dates in this calendar.

• Liturgical yearCompared with: Its adoption changed the civil dates on which some churches observe feasts.

• QuadriviumRelated: Calendar reform depended on astronomical measurements and calculations cultivated in the quadrivium.

• Rudolphine TablesCompared with: The tables used the Gregorian calendar for their dates, distinguishing their civil framework from older astronomical tables.

• Solar yearRelated: Its leap-year corrections more closely approximate the seasonal year's duration.

• Dionysius ExiguusRelated: The Gregorian reform retained the Anno Domini era while changing calendar rules.

• Hindu calendarCompared with: Its fixed civil date structure differs from calendars whose observances follow tithis.

• June solsticeRelated: Its leap-year rules keep June solstice dates near the same calendar days.

• March equinoxRelated: Its leap-year rules keep calendar dates aligned with the seasonal year.

• December solsticeRelated: Its leap-year rules keep December dates near the solstice despite the year's fractional length.

• EpiphanyCompared with: Its date reckoning explains why some churches’ January 6 falls on January 19 in the civil calendar.

• HatsumōdeCompared with: Japan’s 1873 adoption shifted New Year observance from the lunisolar calendar to January 1.

• JanuaryNarrower topic: January’s modern length and position belong to this calendar system.

• Japanese regnal yearsCompared with: Conversions map a Japanese regnal year and date to a Gregorian year.

• Lunar New YearCompared with: Its fixed seasonal structure contrasts with the celebration's date-changing lunisolar basis.

• MonthRelated: Its twelve named months have the familiar lengths from 28 to 31 days.

• Persian calendarCompared with: Both are solar calendars, but their year starts and leap-year rules differ.

• September equinoxRelated: Its leap-year rules keep the September equinox near the same calendar dates.

• Seven-day weekRelated: Its worldwide adoption helped standardize the seven-day cycle in civil life.

• Solar calendarBroader topic: Its leap-year rule approximates the tropical year more closely than the Julian rule.

• DayRelated: Its date changes at civil midnight, establishing the ordinary calendar day.

• Medieval ChurchCompared with: Its later reform shows the church’s continuing role in regulating time, beyond the medieval period.

• New Year's EveNarrower topic: Its year boundary determines when December 31 gives way to January 1.

• WeekRelated: It retains the seven-day week despite correcting the calendar's date alignment.

• Winter solsticeRelated: Its leap-year rules keep solstice dates from drifting substantially through the calendar.