Ptolemaic system

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Ptolemaic system

Ptolemaic system

The astronomical system of Ptolemy, in which the earth is at the center of the universe with the sun, moon, planets, and stars revolving about it in circular orbits at increasing distance. Some of the orbits have epicycles.

Ptolemaic system

(Astronomy) the theory of planetary motion developed by Ptolemy from the hypotheses of earlier philosophers, stating that the earth lay at the centre of the universe with the sun, the moon, and the known planets revolving around it in complicated orbits. Beyond the largest of these orbits lay a sphere of fixed stars. See also epicycle1 Compare Copernican system

Ptolema′ic sys`tem

Ptolemy's conception of the universe, with the earth as the fixed center and the heavenly bodies moving about it.
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Ptolemaic system
Ptolemy believed that Earth was at the center of the universe and that the sun and planets orbited Earth (with the planets also moving in smaller circles called epicycles). In this system, the centers of Mercury's and Venus's epicycles always lie on the line shown in the diagram between Earth and the sun.

Ptol·e·ma·ic system

The astronomical system of Ptolemy, in which Earth is at the center of the universe and all celestial bodies revolve around it. The sun, moon, and planets revolve at different levels in circular orbits, and the stars lie in fixed locations on a sphere that revolves beyond these orbits.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Ptolemaic system - (astronomy) Ptolemy's model of the universe with the Earth at the center
framework, model, theoretical account - a hypothetical description of a complex entity or process; "the computer program was based on a model of the circulatory and respiratory systems"
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
References in periodicals archive ?
Anyone seeking references to Riccioli in the "scholarship" will read--as Christopher Graney amply illustrates with examples going back two centuries--that "Riccioli had no real arguments to support the geocentric system other than the Bible and the authority of the Church" (cited 104).
Geocentric system of coordinates with the help of altitudes and longitude is used.
That truth has changed dramatically from a flat, geocentric system, to the vast universe we now perceive.
The GOPE point is the reference point of the International Terrestrial Reference System (ITRS), which enables accurate connecting test measurements to the current geocentric system.
To make a lasting impression on his royal patron, Archimedes seeks a universe vaster than the commonly accepted geocentric system of his day, with its tightly nested heavenly spheres arrayed concentrically around a stationary Earth.