About: Ptolemy's table of chords

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The table of chords, created by the Greek astronomer, geometer, and geographer Ptolemy in Egypt during the 2nd century AD, is a trigonometric table in Book I, chapter 11 of Ptolemy's Almagest, a treatise on mathematical astronomy. It is essentially equivalent to a table of values of the sine function. It was the earliest trigonometric table extensive enough for many practical purposes, including those of astronomy (an earlier table of chords by Hipparchus gave chords only for arcs that were multiples of 7+1/2° = π/24 radians). Centuries passed before more extensive trigonometric tables were created. One such table is the Canon Sinuum created at the end of the 16th century.

Attributes	Values
rdf:type	work yago:Abstraction100002137 yago:Function113783816 yago:MathematicalRelation113783581 yago:Relation100031921 yago:WikicatElementarySpecialFunctions
rdfs:label	Tabla de cuerdas de Ptolomeo (es) Ptolemy's table of chords (en) 托勒密全弦表 (zh)
rdfs:comment	La tabla de cuerdas, creada por el astrónomo, geómetra y geógrafo griego Ptolomeo en Egipto durante el siglo II d. C., es una tabla trigonométrica contenida en el Libro I, Capítulo 11 del Almagesto, un tratado sobre . Es esencialmente equivalente a una tabla de valores de la función seno. Fue la primera tabla trigonométrica suficientemente extensa para muchos propósitos prácticos, incluidos los de la astronomía (una tabla anterior de cuerdas calculada por Hiparco solo incluía las cuerdas de arcos que eran múltiplos de 712° = π24 radianes). Pasaron siglos antes de que se crearan tablas trigonométricas más extensas. Una de esas tablas es el Canon Sinuum, creado a finales del siglo XVI. (es) The table of chords, created by the Greek astronomer, geometer, and geographer Ptolemy in Egypt during the 2nd century AD, is a trigonometric table in Book I, chapter 11 of Ptolemy's Almagest, a treatise on mathematical astronomy. It is essentially equivalent to a table of values of the sine function. It was the earliest trigonometric table extensive enough for many practical purposes, including those of astronomy (an earlier table of chords by Hipparchus gave chords only for arcs that were multiples of 7+1/2° = π/24 radians). Centuries passed before more extensive trigonometric tables were created. One such table is the Canon Sinuum created at the end of the 16th century. (en)
foaf:depiction
dcterms:subject	Elementary special functions History of astronomy Ptolemy Mathematical tables Trigonometry History of mathematics
Wikipage page ID	30684123 (xsd:integer)
Wikipage revision ID	1107361770 (xsd:integer)
Link from a Wikipage to another Wikipage	Canon Sinuum (Bürgi) Ptolemy Quadrilateral Base 10 Almagest Elementary special functions Versine Decagon Johan Ludvig Heiberg (historian) Ptolemy's theorem Circle Egypt Greece Greek alphabet Greek mathematics History of astronomy Aristarchus's inequality Sine Fundamentum Astronomiae Pentagon Madhava's sine table Ptolemy Linear interpolation Cyclic quadrilateral Euclid Euclid's Elements Numeral system Hexagon Hipparchus Aryabhata's sine table Mathematical tables Trigonometry Chord (geometry) History of mathematics Ancient Greek music Olaf Pedersen Euclidean geometry Exsecant Scale of chords Sexagesimal Mathematical astronomy Odense University Press Trigonometric table
Link from a Wikipage to an external page	http://www.wilbourhall.org/pdfs/HeibergAlmagestComplete.pdf https://archive.org/details/bub_gb_a9nvvbG-OOIC https://hypertextbook.com/eworld/chords/
sameAs	Ptolemy's table of chords Ptolemy's table of chords Ptolemy's table of chords Ptolemy's table of chords Ptolemy's table of chords Ptolemy's table of chords
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thumbnail	wiki-commons:Special:FilePath/Chords_(circle).svg?width=300
has abstract	La tabla de cuerdas, creada por el astrónomo, geómetra y geógrafo griego Ptolomeo en Egipto durante el siglo II d. C., es una tabla trigonométrica contenida en el Libro I, Capítulo 11 del Almagesto, un tratado sobre . Es esencialmente equivalente a una tabla de valores de la función seno. Fue la primera tabla trigonométrica suficientemente extensa para muchos propósitos prácticos, incluidos los de la astronomía (una tabla anterior de cuerdas calculada por Hiparco solo incluía las cuerdas de arcos que eran múltiplos de 712° = π24 radianes). Pasaron siglos antes de que se crearan tablas trigonométricas más extensas. Una de esas tablas es el Canon Sinuum, creado a finales del siglo XVI. (es) The table of chords, created by the Greek astronomer, geometer, and geographer Ptolemy in Egypt during the 2nd century AD, is a trigonometric table in Book I, chapter 11 of Ptolemy's Almagest, a treatise on mathematical astronomy. It is essentially equivalent to a table of values of the sine function. It was the earliest trigonometric table extensive enough for many practical purposes, including those of astronomy (an earlier table of chords by Hipparchus gave chords only for arcs that were multiples of 7+1/2° = π/24 radians). Centuries passed before more extensive trigonometric tables were created. One such table is the Canon Sinuum created at the end of the 16th century. (en)
gold:hypernym	Table
prov:wasDerivedFrom	wikipedia-en:Ptolemy's_table_of_chords?oldid=1107361770&ns=0
page length (characters) of wiki page	14246 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Ptolemy's_table_of_chords
is Link from a Wikipage to another Wikipage of	Canon Sinuum (Bürgi) Ptolemy List of circle topics Almagest List of trigonometric identities Versine Ptolemy's theorem Chord function Trigonometric tables

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