Islamic lunar calendar
E148310
The Islamic lunar calendar is a purely lunar, 12‑month religious calendar used by Muslims worldwide to determine the dates of Islamic holidays, rituals, and events.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Islamic lunar calendar canonical | 4 |
| Islamic calendar | 1 |
| Muslim calendar | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1289409 — 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: Islamic lunar calendar Context triple: [Dhu al-Hijjah, partOf, Islamic lunar calendar]
-
A.
Israeli civil calendar
The Israeli civil calendar is the official calendar system used in Israel that combines the Gregorian and Hebrew calendars to schedule national holidays, memorial days, and public life.
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B.
Hebrew calendar
The Hebrew calendar is a lunisolar calendar used primarily for Jewish religious observances, holidays, and the determination of ceremonial dates.
-
C.
Hindu lunisolar calendar
The Hindu lunisolar calendar is a traditional timekeeping system used across the Indian subcontinent that combines lunar months with solar years to determine religious festivals, rituals, and regional New Year dates.
-
D.
Jalali calendar
The Jalali calendar is a highly accurate solar calendar developed in 11th-century Persia under the guidance of polymath Omar Khayyam and used as a basis for the modern Iranian calendar.
-
E.
Islamic crescent
The Islamic crescent is a widely recognized symbol associated with Islam and many Muslim-majority nations, often depicted as a crescent moon sometimes accompanied by a star.
- 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: Islamic lunar calendar Target entity description: The Islamic lunar calendar is a purely lunar, 12‑month religious calendar used by Muslims worldwide to determine the dates of Islamic holidays, rituals, and events.
-
A.
Israeli civil calendar
The Israeli civil calendar is the official calendar system used in Israel that combines the Gregorian and Hebrew calendars to schedule national holidays, memorial days, and public life.
-
B.
Hebrew calendar
The Hebrew calendar is a lunisolar calendar used primarily for Jewish religious observances, holidays, and the determination of ceremonial dates.
-
C.
Hindu lunisolar calendar
The Hindu lunisolar calendar is a traditional timekeeping system used across the Indian subcontinent that combines lunar months with solar years to determine religious festivals, rituals, and regional New Year dates.
-
D.
Jalali calendar
The Jalali calendar is a highly accurate solar calendar developed in 11th-century Persia under the guidance of polymath Omar Khayyam and used as a basis for the modern Iranian calendar.
-
E.
Islamic crescent
The Islamic crescent is a widely recognized symbol associated with Islam and many Muslim-majority nations, often depicted as a crescent moon sometimes accompanied by a star.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
calendar system
ⓘ
lunar calendar ⓘ religious calendar ⓘ |
| alsoKnownAs |
Hijri calendar
ⓘ
Islamic lunar calendar ⓘ
surface form:
Islamic calendar
|
| basedOn | observation of the new crescent moon ⓘ |
| basisOf | Islamic religious year ⓘ |
| causes | Islamic months to move through the seasons ⓘ |
| determinesDateOf |
Eid al-Adha
ⓘ
Eid al-Fitr ⓘ Hajj ⓘ Hijri calendar ⓘ
surface form:
Islamic New Year
Ramadan fasting ⓘ |
| doesNotUseLeapMonths | true ⓘ |
| epochEvent |
Hijrah of Prophet Muhammad
ⓘ
surface form:
Hijra of Prophet Muhammad from Mecca to Medina
|
| epochYear | 622 CE ⓘ |
| follows | lunar cycle ⓘ |
| governs |
timing of Islamic fasting
ⓘ
timing of Islamic pilgrimage ⓘ timing of major Islamic festivals ⓘ |
| hasAverageYearLengthInDays | about 354 ⓘ |
| hasMonth |
Dhu al-Hijjah
ⓘ
Dhu al-Qadah ⓘ Jumada al-akhira ⓘ Jumada al-ula ⓘ Muharram ⓘ Rabi al-awwal ⓘ Rabi al-thani ⓘ Rajab ⓘ Ramadan ⓘ Safar ⓘ Shawwal ⓘ Sha'ban ⓘ
surface form:
Shaʿban
|
| hasMonthLength | 29 or 30 days ⓘ |
| hasNumberOfMonths | 12 ⓘ |
| hasSacredMonth |
Dhu al-Hijjah
ⓘ
Dhu al-Qadah ⓘ Muharram ⓘ Rajab ⓘ |
| isLunisolar | false ⓘ |
| isPurelyLunar | true ⓘ |
| primaryUsageRegion | Muslim-majority countries ⓘ |
| shorterThan | Gregorian calendar year ⓘ |
| usedAlongside |
Gregorian calendar (Western churches)
ⓘ
surface form:
Gregorian calendar
|
| usedBy | Muslims ⓘ |
| usedFor |
determining dates of Islamic events
ⓘ
determining dates of Islamic holidays ⓘ determining dates of Islamic rituals ⓘ |
| usedIn | Islamic religious observances ⓘ |
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: Islamic lunar calendar Description of subject: The Islamic lunar calendar is a purely lunar, 12‑month religious calendar used by Muslims worldwide to determine the dates of Islamic holidays, rituals, and events.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Islamic calendar
this entity surface form:
Muslim calendar