Ancient Greek astronomy
22 entries in the Ancient Greek Astronomy compendium.
Ancient Greek astronomyGreek astronomy shaped Western celestial knowledge for centuries.Astronomical ringsPortable ring instrument for time and latitude determination, designed by Gemma Frisius.Celestial MattersAlternate history novel blending Greek and Chinese physics.Celestial spheresAncient and medieval model of nested spheres carrying planets and stars.Concentric spheresAncient geocentric model using spheres centered on Earth.Counter-EarthHypothetical planet opposite Earth, proposed by Philolaus.Deferent and epicycleAncient geometric model explaining planetary retrograde motion via circles on circles.Dynamics of the celestial spheresTheories of celestial motion from Plato to medieval scholastics.EquantMathematical point used to explain planetary speed variations.ExeligmosA 54-year, 33-day cycle for predicting similar eclipses.GeocentrismEarth-centered model of the cosmos, dominant for over 1,500 years.Globe of MatelicaAncient Greek marble sundial with inscribed lines and holes.Great YearAmbiguous term for precession cycle or eternal return.HeliocentrismSuperseded model placing Sun at universe's center.Metonic cycle19-year cycle aligning lunar phases with the solar year.Mural instrumentWall-mounted angle measurer for meridian astronomy.Pythagorean astronomical systemEarly non-geocentric model with Earth orbiting a Central Fire.The Sand ReckonerArchimedes devised a system to name and calculate extremely large numbers.ScapheAncient Greek hemispherical sundial, commonly attributed to later astronomers such as Berossus.Spherical EarthEarth is approximately spherical, confirmed by ancient and modern science.Sublunary sphereThe changing realm below the Moon in classical cosmology.UraniaMuse of astronomy and astrology in Greek mythology.
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