Gregorian calendar (Western churches)

E4645

calendar system civil calendar solar calendar

The Gregorian calendar (Western churches) is the internationally used solar dating system introduced in 1582 that most Western Christian churches follow for determining liturgical dates and feasts.

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All labels observed (12)

Label	Occurrences
Gregorian calendar	364
Gregorian calendar reform	6
Gregorian	1
Gregorian calendar (Western churches) canonical	1
Gregorian calendar (as used by the Armenian Apostolic Church for feasts fixed to civil dates)	1
Gregorian calendar (civil)	1
Gregorian calendar (for liturgical feasts in many dioceses)	1
Gregorian calendar (in some churches)	1
Gregorian calendar (in some jurisdictions)	1
Gregorian calendar (with some traditional usages)	1
Gregorian calendar era	1
New Style (Gregorian calendar)	1

How this entity was disambiguated

This entity first appeared as the object of triple T35169 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Gregorian calendar (Western churches)
Context triple: [Easter, calendarSystem, Gregorian calendar (Western churches)]

A. Hebrew calendar
The Hebrew calendar is a lunisolar calendar used primarily for Jewish religious observances, holidays, and the determination of ceremonial dates.
B. Roman Catholicism
Roman Catholicism is the largest Christian denomination, centered on the authority of the Pope and the teachings and sacramental traditions of the Catholic Church.
C. Easter
Easter is the principal Christian festival celebrating the resurrection of Jesus Christ from the dead, observed with religious services and various cultural traditions worldwide.
D. Nicene Creed
The Nicene Creed is an ancient Christian statement of faith, formulated at the Councils of Nicaea and Constantinople, that defines core doctrines about the Trinity and the nature of Christ and is widely used in liturgical worship across many denominations.
E. Eastern Orthodox Christianity
Eastern Orthodox Christianity is one of the three main branches of Christianity, characterized by its continuity with the early Church, its liturgical worship, and its communion of autocephalous churches centered primarily in Eastern Europe and the Middle East.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Gregorian calendar (Western churches)
Target entity description: The Gregorian calendar (Western churches) is the internationally used solar dating system introduced in 1582 that most Western Christian churches follow for determining liturgical dates and feasts.

A. Hebrew calendar
The Hebrew calendar is a lunisolar calendar used primarily for Jewish religious observances, holidays, and the determination of ceremonial dates.
B. Roman Catholicism
Roman Catholicism is the largest Christian denomination, centered on the authority of the Pope and the teachings and sacramental traditions of the Catholic Church.
C. Easter
Easter is the principal Christian festival celebrating the resurrection of Jesus Christ from the dead, observed with religious services and various cultural traditions worldwide.
D. Nicene Creed
The Nicene Creed is an ancient Christian statement of faith, formulated at the Councils of Nicaea and Constantinople, that defines core doctrines about the Trinity and the nature of Christ and is widely used in liturgical worship across many denominations.
E. Eastern Orthodox Christianity
Eastern Orthodox Christianity is one of the three main branches of Christianity, characterized by its continuity with the early Church, its liturgical worship, and its communion of autocephalous churches centered primarily in Eastern Europe and the Middle East.
F. None of above. chosen

Statements (40)

Predicate	Object
instanceOf	calendar system ⓘ civil calendar ⓘ solar calendar ⓘ
adoptedAsStandardBy	most countries of the world ⓘ
adoptedGraduallyBy	Europe ⓘ surface form: European states
aligns	feast of Christmas with December 25 in civil calendar ⓘ
basedOn	tropical year ⓘ
contrastedWith	Julian calendar ⓘ surface form: Julian calendar (Eastern churches) Revised Julian calendar ⓘ
corrects	drift of the date of the vernal equinox ⓘ
follows	solar year ⓘ
governs	cycle of movable feasts in Western churches ⓘ
hasAverageYearLength	365.2425 days ⓘ
hasCalendarType	proleptic extension for earlier dates ⓘ
hasDayCountCommonYear	365 ⓘ
hasDayCountLeapYear	366 ⓘ
hasDesignGoal	keep vernal equinox near March 21 ⓘ
hasEpoch	Anno Domini era ⓘ
hasMonthCount	12 ⓘ
hasType	reform of the Julian calendar ⓘ
hasWeekLength	7 days ⓘ
implementedBy	papal bull Inter gravissimas ⓘ
influences	secular holidays in Western countries ⓘ
introducedBy	Pope Gregory XIII ⓘ
introducedInYear	1582 ⓘ
moreAccurateThan	Julian calendar ⓘ
recognizedAs	de facto international standard calendar ⓘ
replaced	Julian calendar ⓘ
usedBy	Roman Catholicism ⓘ surface form: Roman Catholic Church Western Christianity ⓘ surface form: Western Christian churches most Protestant churches ⓘ
usedFor	civil date reckoning worldwide ⓘ dating Easter in Western churches ⓘ dating Western Christian liturgical calendar ⓘ determining Christian feasts ⓘ determining liturgical dates ⓘ
usedIn	Western liturgical books ⓘ
usedToCompute	date of Easter in Western Christianity ⓘ
usesLeapYearException	century years are not leap years unless divisible by 400 ⓘ
usesLeapYearRule	every 4th year is a leap year ⓘ

How these facts were elicited