Ptolemy’s trigonometry
E1459835
UNEXPLORED
Ptolemy’s trigonometry is the system of geometric and numerical methods for calculating chords and angles in circles developed by the Greco-Roman astronomer Claudius Ptolemy, foundational for ancient and medieval astronomy.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Ptolemy’s trigonometry canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T20963302 — 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: Ptolemy’s trigonometry Context triple: [Tahrir al-Majisti, commentaryOn, Ptolemy’s trigonometry]
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A.
Ptolemy’s equant
Ptolemy’s equant is a geometric device in his planetary theory that allows planets to move with uniform angular speed around an off-center point, introduced to better match observed non-uniform planetary motion.
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B.
Canon doctrinae triangulorum
Canon doctrinae triangulorum is a 16th-century trigonometric table and treatise by Georg Joachim Rheticus that significantly advanced the use of trigonometry in astronomy and mathematics.
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C.
Prutenic Tables
The Prutenic Tables were influential 16th-century astronomical tables based on Copernican heliocentric theory, used for predicting planetary positions before being superseded by more accurate works like the Rudolphine Tables.
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D.
On the Measurement of the Circle
On the Measurement of the Circle is a mathematical treatise by Archimedes in which he rigorously approximates the value of π and explores properties of circles.
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E.
Opus Palatinum de Triangulis
Opus Palatinum de Triangulis is a major 16th-century mathematical treatise that systematically develops trigonometry, especially trigonometric tables, and significantly advanced astronomical calculation.
- 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: Ptolemy’s trigonometry Target entity description: Ptolemy’s trigonometry is the system of geometric and numerical methods for calculating chords and angles in circles developed by the Greco-Roman astronomer Claudius Ptolemy, foundational for ancient and medieval astronomy.
-
A.
Ptolemy’s equant
Ptolemy’s equant is a geometric device in his planetary theory that allows planets to move with uniform angular speed around an off-center point, introduced to better match observed non-uniform planetary motion.
-
B.
Canon doctrinae triangulorum
Canon doctrinae triangulorum is a 16th-century trigonometric table and treatise by Georg Joachim Rheticus that significantly advanced the use of trigonometry in astronomy and mathematics.
-
C.
Prutenic Tables
The Prutenic Tables were influential 16th-century astronomical tables based on Copernican heliocentric theory, used for predicting planetary positions before being superseded by more accurate works like the Rudolphine Tables.
-
D.
On the Measurement of the Circle
On the Measurement of the Circle is a mathematical treatise by Archimedes in which he rigorously approximates the value of π and explores properties of circles.
-
E.
Opus Palatinum de Triangulis
Opus Palatinum de Triangulis is a major 16th-century mathematical treatise that systematically develops trigonometry, especially trigonometric tables, and significantly advanced astronomical calculation.
- F. None of above. chosen
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.