Ptolemy system keywords (i.e., Ptolemy (c.100--c.170 CE) keywords): Almagest (c.150 CE), Apollonius of Perga (c.262--c.190 BCE) apsis (apoapsis, periapsis, aphelion, perihelion, apogee perigee), apparent retrograde motion, Aristarchos of Samos (c.310--c.230 BCE), Aristotle (384--322 BCE), astrology, Crater Ptolemaeus (lunar crater), crime of Ptolemy, deferent, Earth ⊕, epicycle, epicycle model, equant, equant eccentricity, Geographia, Harmonics, heliocentric solar system, Heraclides Ponticus (c.390--c.310 BCE), Hicetas (c.400--c.335 BCE), Hipparchus (c.190--120 BCE), Hypatia (c.360--415 CE), Moon ☽, nebulae (in the historical sense), Nicolaus Copernicus (1473--1543), Optics, orbit, orbital period, Philolaic system, Philolaus (c.470--c.385 BCE), planet (Mercury ☿, Venus ♀, Earth ⊕, Mars ♂, Jupiter ♃, Saturn ♄, Sun ☉, Moon ☽, inferior planet, superior planet), planetary configuration, Planetary Hypotheses (c.150), planetary system, Ptolemaic system, Ptolemy (c.100--c.170 CE) (his books Almagest (c.150 CE), Geographia (c.150 CE), Handy Tables (c.150 CE), Harmonics (c.150 CE), Optics (c.150 CE), Planetary Hypotheses (c.150), Tetrabiblos (c.150 CE)), Ptolemy's catalog of 1022 stars in 48 constellations, Ptolemy's inequality, Ptolemy's theorem, revolution, Seleucus of Seleucia (fl. 150 BCE), Solar System, Sun ☉, synodic period, Tetrabiblos (c.150 CE), Theon of Alexandria (c.335--c.405 CE), zodiac, zodiac constellations, zodiac sign, etc.
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