Linked from

The 63 pages that link to Ptolemy, each with the reason it gives.

• Apparent magnitudeRelated: The surviving catalog helped transmit the early magnitude classifications.

• CartographyRelated: His coordinate-based geography influenced European mapmaking for centuries.

• Babylonian astronomyRelated: The astronomical tradition he inherited incorporated data with Babylonian origins.

• HipparchusRelated: Ptolemy preserved and discussed important results attributed to Hipparchus.

• LongitudeRelated: His maps and coordinates helped establish longitude as a geographic measurement.

• AstrolabeRelated: His mathematical astronomy provided models and methods used in the astrolabe tradition.

• Tropical yearRelated: His account preserved ancient measurements of the equinox shift and year lengths.

• AstrologyRelated: His work systematized influential principles of Hellenistic astrology.

• EquinoxRelated: His astronomical work inherited and transmitted equinox observations used to track celestial motion.

• StraboRelated: Ptolemy’s coordinate-based Geography offers a later, contrasting form of ancient geographical scholarship.

• ConstellationRelated: His Almagest catalogued 48 constellations that influenced later European star atlases.

• Snell's lawRelated: His measurements documented refraction, though they did not establish the exact sine relation.

• Axial precessionRelated: His account transmitted the classical explanation and observations of precession.

• Islamic astronomyRelated: His Almagest became a central source for Arabic-language astronomical scholarship.

• Degree (angle)Related: His astronomical tables transmitted degree-based angular measurements.

• Blue NileRelated: His writings preserved ancient speculation about the Nile’s sources.

• Natural philosophyRelated: His mathematical astronomy became a major account of the heavens within natural philosophy.

• Precession of the equinoxesRelated: His account preserved the ancient estimate and model of equinoctial precession.

• Ancient Greek astronomyRelated: His synthesis became the principal reference for mathematical astronomy for many centuries.

• Ptolemy's theoremRelated: The theorem bears his name and appears in his mathematical work.

• Apollonius of PergaRelated: His astronomy developed within the mathematical culture shaped by Hellenistic geometry.

• EquantRelated: Ptolemy developed the equant as part of his mathematical account of planetary motion.

• Johann BayerRelated: Ptolemy’s star catalogue was a foundational precedent for later celestial atlases.

• Deferent and epicycleRelated: He used deferents, epicycles, and equants to construct predictive planetary models.

• Terra AustralisRelated: His geography left large southern regions uncertain, inviting later mapmakers to imagine land there.

• Armillary sphereRelated: Ptolemy described instruments and observational practices within the tradition that used armillary spheres.

• Ibn al-HaythamRelated: His optical work was a major source Ibn al-Haytham scrutinized.

• Leo AfricanusCompared with: His inherited geographical framework contrasts with the firsthand travel observations attributed to Leo Africanus.

• Spherical astronomyRelated: The Almagest preserved and organized geometric techniques used to calculate celestial positions.

• Ursa MajorRelated: His star catalogue included Ursa Major in the classical constellation tradition.

• Al-IdrisiRelated: His coordinates and geographical ideas formed part of the intellectual inheritance available to medieval geographers.

• Gerard of CremonaRelated: Gerard translated Ptolemy’s Almagest from Arabic, transmitting his astronomy into Latin.

• Gerardus MercatorRelated: Mercator edited and published Ptolemy’s maps, engaging directly with this inherited tradition.

• CruxRelated: Crux's stars appeared in his catalogue as part of the larger Centaurus.

• SexagesimalRelated: His astronomical tables used subdivisions that preserved the sexagesimal tradition.

• Tropic of CancerRelated: His geographic tradition helped transmit the named tropics through medieval scholarship.

• Menelaus's theoremRelated: Ptolemy discusses Menelaus's results in the tradition that preserved the theorem.

• Naked-eye astronomyRelated: His synthesis organized naked-eye measurements into a predictive account of planetary motion.

• Saros cycleRelated: Ptolemy discussed eclipse periods and preserved evidence of ancient cycle-based prediction.

• Anomalistic monthRelated: Refined Hipparchus's lunar model, handling the anomalistic period within his eccentric-epicycle theory.

• Argo NavisRelated: His star catalogue included the ancient constellation of the ship Argo.

• Celestial cartographyRelated: His star catalog preserved positions for hundreds of stars in the ancient tradition.

• Canis MajorRelated: Canis Major appears among the constellations recorded in his influential star catalog.

• Ursa MinorRelated: Ursa Minor appears among the 48 constellations listed in his Almagest.

• Orion’s BeltRelated: His catalogue transmitted Orion’s classical placement into later astronomical traditions.

• Spherical EarthRelated: His geography treated Earth as spherical and transmitted that model across centuries.

• Piscis AustrinusRelated: Piscis Austrinus appears among the constellations catalogued in his Almagest.

• Abd al-Rahman al-SufiRelated: Al-Sufi used Ptolemy’s star catalog as the foundation for his own revisions.

• Canis MinorRelated: His star catalog included Canis Minor among the 48 constellations later transmitted through European astronomy.

• Corona AustralisRelated: Corona Australis appears among the constellations catalogued in his Almagest.