Easter computus
E940858
Easter computus is the set of calendrical calculations historically used by Christian churches to determine the date of Easter each year.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Alexandrian computus | 1 |
| Easter computus canonical | 1 |
| Julian computus | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11691438 — 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: Easter computus Context triple: [De temporum ratione, describes, Easter computus]
-
A.
Gregorian computus
Gregorian computus is the method used in the Gregorian calendar to calculate the date of Easter each year based on a refined solar and lunar cycle.
-
B.
Coptic Epact Numbers
Coptic Epact Numbers is a Unicode block that encodes the historic numeral system used for writing numbers in the Coptic script.
-
C.
Zeller’s congruence
Zeller’s congruence is a mathematical formula used to determine the day of the week for any given date in the Gregorian or Julian calendar.
-
D.
Orthodox Paschalion
Orthodox Paschalion is the traditional method used by Eastern Orthodox churches to calculate the date of Easter and related movable feasts based on specific lunar and solar rules.
-
E.
Ambrosian calendar
The Ambrosian calendar is the liturgical calendar of the Ambrosian Rite used primarily in the Archdiocese of Milan, featuring its own cycle of feasts and observances distinct from the Roman Rite.
- 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: Easter computus Target entity description: Easter computus is the set of calendrical calculations historically used by Christian churches to determine the date of Easter each year.
-
A.
Gregorian computus
Gregorian computus is the method used in the Gregorian calendar to calculate the date of Easter each year based on a refined solar and lunar cycle.
-
B.
Coptic Epact Numbers
Coptic Epact Numbers is a Unicode block that encodes the historic numeral system used for writing numbers in the Coptic script.
-
C.
Zeller’s congruence
Zeller’s congruence is a mathematical formula used to determine the day of the week for any given date in the Gregorian or Julian calendar.
-
D.
Orthodox Paschalion
Orthodox Paschalion is the traditional method used by Eastern Orthodox churches to calculate the date of Easter and related movable feasts based on specific lunar and solar rules.
-
E.
Ambrosian calendar
The Ambrosian calendar is the liturgical calendar of the Ambrosian Rite used primarily in the Archdiocese of Milan, featuring its own cycle of feasts and observances distinct from the Roman Rite.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Christian liturgical practice
ⓘ
algorithm ⓘ calendar calculation method ⓘ |
| aimsTo | standardize the celebration date of Easter among Christians ⓘ |
| appliesTo | liturgical year ⓘ |
| assumes | fixed ecclesiastical equinox on March 21 ⓘ |
| basedOn |
ecclesiastical approximation of the vernal equinox
ⓘ
ecclesiastical full moon ⓘ lunar cycles ⓘ solar year ⓘ |
| constrainedBy |
Council of Nicaea decision on Easter
ⓘ
linked to:
First Council of Nicaea
|
| defines | date of Easter Sunday ⓘ |
| developedIn |
Late Antiquity
ⓘ
Middle Ages ⓘ |
| documentedIn | medieval computus manuscripts ⓘ |
| followsRule |
Easter is the Sunday after the Paschal full moon
ⓘ
linked to:
Easter
Paschal full moon is the first full moon on or after the ecclesiastical vernal equinox ⓘ |
| hasVariant |
Alexandrian computus
ⓘ
linked to:
Easter computus
Gregorian computus ⓘ Julian computus ⓘ Roman computus ⓘ |
| historicallyUsedBy |
Church of Alexandria
ⓘ
linked to:
Orthodox Church of Alexandria
Church of Rome ⓘ
linked to:
Roman Church
Eastern Orthodox Church ⓘ
linked to:
Eastern Orthodox Christianity
Oriental Orthodox churches ⓘ
linked to:
Oriental Orthodoxy
Western Church ⓘ
linked to:
Western Christianity
|
| influences |
date of Ascension
ⓘ
date of Pentecost ⓘ date of movable feasts ⓘ start of Lent ⓘ |
| involves |
19-year lunar cycle
ⓘ
Dominical letter ⓘ Golden Number ⓘ Metonic cycle ⓘ Paschal full moon ⓘ epact calculation ⓘ leap year rules ⓘ |
| relatedTo |
Paschal tables
ⓘ
ecclesiastical calendar ⓘ |
| requires |
arithmetical operations
ⓘ
knowledge of leap year cycles ⓘ |
| studiedIn |
chronology
ⓘ
history of science ⓘ liturgical studies ⓘ |
| usedBy | Christian churches ⓘ |
| usedFor | determining the date of Easter ⓘ |
| usesCalendar |
Gregorian calendar
ⓘ
linked to:
Gregorian calendar (Western churches)
Julian calendar ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Easter computus Description of subject: Easter computus is the set of calendrical calculations historically used by Christian churches to determine the date of Easter each year.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Easter computus
linked to: Easter computus