(astronomy) A geocentric model of the solar system, described by the eponymous astronomer.

The Ptolemaic dynasty.

Ptolemaic

Alternative form of Ptolemaian

(geometry) A theorem that states in a cyclic quadrilateral, the product of the lengths of its diagonals is equal to the sum of the products of the lengths of the two pairs of opposite sides.

Alternative form of Ptolemaic

The geocentric Ptolemaic system of astronomy. / (by extension) Any belief system or model that gives undue importance to the observer.