Samrat Yantra
E306141
Samrat Yantra is a massive stone sundial at Jaipur’s Jantar Mantar observatory, renowned for its precise astronomical timekeeping.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Samrat Yantra canonical | 4 |
| Samrat Yantra at Jantar Mantar, Jaipur | 1 |
| ‘Samrat Yantra’ means ‘Supreme Instrument’ in Hindi/Sanskrit | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2838541 — 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: Samrat Yantra Context triple: [Jantar Mantar, Jaipur, hasSundial, Samrat Yantra]
-
A.
Jai Prakash Yantra
Jai Prakash Yantra is an astronomical instrument at Jaipur’s Jantar Mantar observatory used to measure the positions of celestial bodies with high precision.
-
B.
Shanku Yantra
Shanku Yantra is an ancient gnomon-based sundial instrument at Jantar Mantar in New Delhi used for measuring time and the Sun’s position.
-
C.
Rama Yantra
Rama Yantra is a large cylindrical astronomical instrument at Jantar Mantar in New Delhi used for measuring the altitude and azimuth of celestial bodies.
-
D.
Jantar Mantar, Mathura
Jantar Mantar, Mathura is an 18th-century astronomical observatory in Uttar Pradesh, India, built by Maharaja Sawai Jai Singh II for precise celestial observations and timekeeping.
-
E.
Jantar Mantar, Varanasi
Jantar Mantar, Varanasi is an 18th-century astronomical observatory in Varanasi, India, featuring masonry instruments built by Maharaja Jai Singh II for precise celestial observations and timekeeping.
- 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: Samrat Yantra Target entity description: Samrat Yantra is a massive stone sundial at Jaipur’s Jantar Mantar observatory, renowned for its precise astronomical timekeeping.
-
A.
Jai Prakash Yantra
Jai Prakash Yantra is an astronomical instrument at Jaipur’s Jantar Mantar observatory used to measure the positions of celestial bodies with high precision.
-
B.
Shanku Yantra
Shanku Yantra is an ancient gnomon-based sundial instrument at Jantar Mantar in New Delhi used for measuring time and the Sun’s position.
-
C.
Rama Yantra
Rama Yantra is a large cylindrical astronomical instrument at Jantar Mantar in New Delhi used for measuring the altitude and azimuth of celestial bodies.
-
D.
Jantar Mantar, Mathura
Jantar Mantar, Mathura is an 18th-century astronomical observatory in Uttar Pradesh, India, built by Maharaja Sawai Jai Singh II for precise celestial observations and timekeeping.
-
E.
Jantar Mantar, Varanasi
Jantar Mantar, Varanasi is an 18th-century astronomical observatory in Varanasi, India, featuring masonry instruments built by Maharaja Jai Singh II for precise celestial observations and timekeeping.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical instrument
ⓘ
heritage monument ⓘ sundial ⓘ |
| approximateCompletionYear | 1734 ⓘ |
| associatedObservatoryNetwork | Jantar Mantars built in Delhi, Ujjain, Varanasi, and Mathura ⓘ |
| associatedWith | Maharaja Sawai Jai Singh II’s program of astronomical reform ⓘ |
| category |
architectural astronomy
ⓘ
historical observatory instrument ⓘ |
| constructedBy |
Maharaja Jai Singh II
ⓘ
surface form:
Maharaja Sawai Jai Singh II
|
| constructedFor |
astronomical observations
ⓘ
calendar calculations ⓘ timekeeping ⓘ |
| constructionStartCentury | 18th century ⓘ |
| culturalSignificance | symbol of India’s pre-modern scientific heritage ⓘ |
| dialType | equinoctial sundial ⓘ |
| etymology |
Samrat Yantra
self-linksurface differs
ⓘ
surface form:
‘Samrat Yantra’ means ‘Supreme Instrument’ in Hindi/Sanskrit
|
| function |
aids in determining celestial coordinates
ⓘ
measures declination of the Sun ⓘ measures local solar time ⓘ |
| gnomonOrientation | aligned with Earth’s rotational axis ⓘ |
| governingBody | Archaeological Survey of India ⓘ |
| hasFeature |
quadrants with graduated scales
ⓘ
stairway along the hypotenuse of the gnomon ⓘ |
| height | about 27 meters ⓘ |
| heritageStatus |
Jantar Mantar, Jaipur
ⓘ
surface form:
UNESCO World Heritage Site (as part of Jantar Mantar, Jaipur)
|
| latitudeAlignment | aligned to latitude of Jaipur ⓘ |
| locatedIn | Jantar Mantar, Jaipur ⓘ |
| locatedInCity | Jaipur ⓘ |
| locatedInCountry | India ⓘ |
| locatedInState | Rajasthan ⓘ |
| material |
marble
ⓘ
stone ⓘ |
| measurementUnit | local time in hours, minutes, and seconds (via scale readings) ⓘ |
| notableFor |
high precision in solar time measurement
ⓘ
integration of architecture and astronomy ⓘ massive scale compared to typical sundials ⓘ |
| orientation | north-south aligned gnomon ⓘ |
| partOf |
Jantar Mantar, Jaipur
ⓘ
surface form:
Jantar Mantar observatory, Jaipur
|
| preservationStatus | protected monument ⓘ |
| relatedWork | other yantras at Jantar Mantar, Jaipur ⓘ |
| shape | triangular gnomon with quadrants on either side ⓘ |
| timeAccuracy | about 2 seconds ⓘ |
| tourismAttraction | major tourist attraction in Jaipur ⓘ |
| usedFor |
astrology-related calculations in historical context
ⓘ
calibrating other instruments at Jantar Mantar ⓘ |
| visitorAccess | open to public ⓘ |
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: Samrat Yantra Description of subject: Samrat Yantra is a massive stone sundial at Jaipur’s Jantar Mantar observatory, renowned for its precise astronomical timekeeping.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Samrat Yantra at Jantar Mantar, Jaipur
this entity surface form:
‘Samrat Yantra’ means ‘Supreme Instrument’ in Hindi/Sanskrit