1. Ptolemaic system - Noun
2. Ptolemaic system - Proper noun
(astronomy) Ptolemy's model of the universe with the Earth at the center
Source: WordNetUnder the instruction of Michael Maestlin, Tübingen's professor of mathematics from 1583 to 1631, he learned both the Ptolemaic system and the Copernican system of planetary motion. Source: Internet
The suggestion of mechanical models for the Earth centred Ptolemaic model "greatly contributed to the eventual triumph of the Ptolemaic system among the Christians of the West". Source: Internet