Revised Julian calendar

E24072

calendar system civil calendar solar calendar

The Revised Julian calendar is a modernized version of the traditional Julian calendar, adopted by several Eastern Orthodox Churches to more closely align fixed feast dates with the Gregorian calendar while retaining the Orthodox Paschalion.

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All labels observed (10)

Label	Occurrences
Revised Julian calendar canonical	26
Revised Julian calendar (in some churches)	2
New Julian calendar	1
Revised Julian Easter calculation	1
Revised Julian calendar (for fixed feasts)	1
Revised Julian calendar (for liturgical purposes in Greece)	1
Revised Julian calendar (for some feasts)	1
Revised Julian calendar (in some jurisdictions)	1
Revised Julian calendar (liturgical)	1
Revised Julian calendar (liturgical, in practice for many parishes)	1

How this entity was disambiguated

This entity first appeared as the object of triple T191419 — 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: Revised Julian calendar
Context triple: [Ecumenical Patriarch of Constantinople, liturgicalCalendar, Revised Julian calendar]

A. Julian calendar
The Julian calendar is an ancient solar calendar introduced by Julius Caesar in 45 BCE, historically used throughout Europe and still employed by some Eastern Christian churches for liturgical purposes.
B. Gregorian calendar (Western churches)
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.
C. Hebrew calendar
The Hebrew calendar is a lunisolar calendar used primarily for Jewish religious observances, holidays, and the determination of ceremonial dates.
D. Metonic cycle
The Metonic cycle is a 19-year astronomical period after which the phases of the Moon recur on the same days of the solar year, forming the basis for many lunisolar calendars.
E. Kislev
Kislev is a late autumn/early winter month in the Hebrew calendar traditionally associated with the festival of Hanukkah.
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: Revised Julian calendar
Target entity description: The Revised Julian calendar is a modernized version of the traditional Julian calendar, adopted by several Eastern Orthodox Churches to more closely align fixed feast dates with the Gregorian calendar while retaining the Orthodox Paschalion.

A. Julian calendar
The Julian calendar is an ancient solar calendar introduced by Julius Caesar in 45 BCE, historically used throughout Europe and still employed by some Eastern Christian churches for liturgical purposes.
B. Gregorian calendar (Western churches)
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.
C. Hebrew calendar
The Hebrew calendar is a lunisolar calendar used primarily for Jewish religious observances, holidays, and the determination of ceremonial dates.
D. Metonic cycle
The Metonic cycle is a 19-year astronomical period after which the phases of the Moon recur on the same days of the solar year, forming the basis for many lunisolar calendars.
E. Kislev
Kislev is a late autumn/early winter month in the Hebrew calendar traditionally associated with the festival of Hanukkah.
F. None of above. chosen

Statements (50)

Predicate	Object
instanceOf	calendar system ⓘ civil calendar ⓘ solar calendar ⓘ
adoptedBy	Orthodox Church of Albania ⓘ surface form: Albanian Orthodox Church Antiochian Orthodox Church ⓘ surface form: Antiochian Orthodox Christian Archdiocese Bulgarian Orthodox Church ⓘ Orthodox Church of Cyprus ⓘ surface form: Church of Cyprus Patriarchate of Constantinople ⓘ surface form: Ecumenical Patriarchate of Constantinople Greek Orthodox Church ⓘ Orthodox Church of the Czech Lands and Slovakia ⓘ Polish Orthodox Church ⓘ Romanian Orthodox Church ⓘ several Eastern Orthodox Churches ⓘ
alsoKnownAs	Milanković calendar ⓘ Revised Julian calendar ⓘ surface form: New Julian calendar
averageYearError	about 2 seconds per year relative to the tropical year ⓘ
basedOn	traditional Julian calendar ⓘ
category	Byzantine liturgical calendar ⓘ surface form: Eastern Orthodox liturgical calendar
coincidesWith	Gregorian calendar from 1900 to 2799 ⓘ
designedToAlignWith	Gregorian calendar (Western churches) ⓘ surface form: Gregorian calendar
developedAt	Pan-Orthodox Congress of 1923 ⓘ
differsFrom	Gregorian calendar after year 2800 ⓘ
easterCalculationBasedOn	Julian calendar ⓘ Orthodox Paschalion ⓘ
follows	solar year ⓘ
introducedInYear	1923 ⓘ
leapYearRule	century years divisible by 900 are leap years only if remainder is 200 or 600 ⓘ every year divisible by 4 is a leap year except some century years ⓘ
moreAccurateThan	Julian calendar ⓘ
notAdoptedBy	Armenian Apostolic Church ⓘ Coptic Orthodox Church ⓘ Eritrean Orthodox Tewahedo Church ⓘ Ethiopian Orthodox Tewahedo Church ⓘ Georgian Orthodox Church ⓘ Orthodox Church of Jerusalem ⓘ surface form: Jerusalem Patriarchate Russian Orthodox Church ⓘ Serbian Orthodox Church ⓘ Syriac Orthodox Church ⓘ
notUsedFor	calculation of Easter in Eastern Orthodoxy ⓘ
proposedBy	Milutin Milanković ⓘ
purpose	to modernize the Julian calendar ⓘ to reduce drift of fixed feasts relative to the seasons ⓘ
regionUsed	parts of Eastern Europe ⓘ parts of the Middle East ⓘ
retains	Orthodox Paschalion ⓘ
similarAccuracyTo	Gregorian calendar (Western churches) ⓘ surface form: Gregorian calendar
usedBy	some Eastern Catholic Churches of Byzantine rite ⓘ
usesFor	fixed feasts ⓘ saints' days ⓘ
yearLength	365.242222 days ⓘ

How these facts were elicited

Referenced by (36)

Full triples — surface form annotated when it differs from this entity's canonical label.

Ecumenical Patriarch of Constantinople → liturgicalCalendar → Revised Julian calendar ⓘ

Gregorian calendar (Western churches) → contrastedWith → Revised Julian calendar ⓘ

Byzantine Rite → calendarSystem → Revised Julian calendar ⓘ

Great Feast in Eastern Christianity → calendarSystem → Revised Julian calendar ⓘ

Greek Orthodox Church → calendarUsed → Revised Julian calendar ⓘ

Romanian Orthodox Church → calendarUsed → Revised Julian calendar ⓘ

Bulgarian Orthodox Church → calendarUsed → Revised Julian calendar ⓘ

Antiochian Orthodox Church → followsCalendar → Revised Julian calendar ⓘ

this entity surface form: Revised Julian calendar (in some jurisdictions)

Orthodox Church of Cyprus → usesCalendar → Revised Julian calendar ⓘ

this entity surface form: Revised Julian calendar (for fixed feasts)

Orthodox Church of Albania → followsCalendar → Revised Julian calendar ⓘ

Orthodox Church in America → usesCalendar → Revised Julian calendar ⓘ

Revised Julian calendar → alsoKnownAs → Revised Julian calendar ⓘ

this entity surface form: New Julian calendar

Julian calendar → basisOf → Revised Julian calendar ⓘ

Patriarchate of Constantinople → usesCalendar → Revised Julian calendar ⓘ

Ruthenian Greek Catholic Church → usesCalendar → Revised Julian calendar ⓘ

Bulgarian Greek Catholic Church → usesCalendar → Revised Julian calendar ⓘ

Belarusian Greek Catholic Church → followsLiturgicalCalendar → Revised Julian calendar ⓘ

Ukrainian Greek Catholic Church → followsLiturgicalCalendar → Revised Julian calendar ⓘ

Eastern Christianity → usesCalendar → Revised Julian calendar ⓘ

Polish Orthodox Church → usesCalendar → Revised Julian calendar ⓘ

this entity surface form: Revised Julian calendar (for some feasts)

OCA → calendarUsage → Revised Julian calendar ⓘ

Byzantine liturgical calendar → alsoUses → Revised Julian calendar ⓘ

Macedonian Orthodox Church → usesCalendar → Revised Julian calendar ⓘ

Orthodox Paschalion → contrastsWith → Revised Julian calendar ⓘ

this entity surface form: Revised Julian Easter calculation

Milanković calendar → alsoKnownAs → Revised Julian calendar ⓘ

Nativity Fast → calendarSystem → Revised Julian calendar ⓘ

this entity surface form: Revised Julian calendar (in some churches)

Ukrainian Orthodox Church → followsCalendar → Revised Julian calendar ⓘ

Archdiocese of Thyateira and Great Britain → usesCalendar → Revised Julian calendar ⓘ

Metropolis of Denver → followsCalendar → Revised Julian calendar ⓘ

Orthodox Church of Ukraine → calendarUsed → Revised Julian calendar ⓘ

Archeparchy of Lviv → usesCalendar → Revised Julian calendar ⓘ

this entity surface form: Revised Julian calendar (liturgical)

Archeparchy of Ivano-Frankivsk → usesCalendar → Revised Julian calendar ⓘ

this entity surface form: Revised Julian calendar (liturgical, in practice for many parishes)

Greek Catholics → usesLiturgicalCalendar → Revised Julian calendar ⓘ

Midnight Office of Pascha → calendarContext → Revised Julian calendar ⓘ

this entity surface form: Revised Julian calendar (in some churches)

Orthodox churches → liturgicalCalendar → Revised Julian calendar ⓘ

Diocese of Athens → usesCalendar → Revised Julian calendar ⓘ

this entity surface form: Revised Julian calendar (for liturgical purposes in Greece)

All labels observed (10)

How this entity was disambiguated Show

Statements (50)

How these facts were elicited Show

Referenced by (36)

How this entity was disambiguated

How these facts were elicited