# Ptolemy's table of chords

> 2nd century CE trigonometric table

**Wikidata**: [Q7257100](https://www.wikidata.org/wiki/Q7257100)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Ptolemy's_table_of_chords)  
**Source**: https://4ort.xyz/entity/ptolemy-s-table-of-chords


## References

1. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)