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Summary
Ptolemy was born on 100[1] in Ptolemais Hermiou[2]. He died on 170[3] in Alexandria[4]. He worked as a mathematician[5], geographer[6], astronomer[7], astrologer[8], and music theorist[9]. He ranks in the top 0.56% of human entities by monthly Wikipedia readership (23,417 views/month, #5,598 of 1,000,298).[10]
Things named for Ptolemy include his world map[49], his theorem[50], Lake Ptolemy[51], his inequality[52], Ptolemaeus[53], 4001 Ptolemaeus[54], Mount Ptolemy[55], and Ptolémée Prize[56].
Why It Matters
Ptolemy has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[57] He is known by 134 alternative names across languages and contexts.[58]
He has been cited as an influence by Christopher Columbus[59], an explorer[60], 1450–1506[61], of Republic of Genoa[62], specialised in sea shipping[63]; Nicolaus Copernicus[64], an astronomer[65], 1473–1543[66], of Kingdom of Poland[67], awarded the International Space Hall of Fame[68], specialised in astronomy[69]; Hypatia[70], a mathematician[71], 0360–0415[72], of Byzantine Empire[73], specialised in astronomy[74]; and Al-Battani[75], a mathematician[76], 0858–0930[77], specialised in astronomy[78].
He is credited with the discovery of Argo Navis[79], a former constellation[80]; equant[81], a mathematical concept[82]; and Messier 7[83], an open cluster[84]. Works attributed to him include Almagest[85], a literary work[86], founded in 0148[87]; Geography[88]; and Tetrabiblos[89]. Entities named for him include his world map[49], his theorem[50], Lake Ptolemy[51], his inequality[52], Ptolemaeus[53], and 4001 Ptolemaeus[54].
Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.
APA4ort.xyz Knowledge Graph. (2026). Ptolemy. Retrieved October 14, 2026, from https://4ort.xyz/entity/ptolemy
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