The History of Science by Britannica Educational Publishing
Author:Britannica Educational Publishing
Language: eng
Format: epub
ISBN: 978-1-62275-117-4
Publisher: Britannica Educational Publishing
Published: 2014-12-15T00:00:00+00:00
COPERNICAN SYSTEM
In astronomy, the model of the solar system centred on the Sun, with Earth and other planets moving around it, formulated by Nicolaus Copernicus, and published in 1543 is known as the Copernican system. It appeared with an introduction by Rhäticus (Rheticus) in the previously mentioned De revolutionibus orbium coelestium libri VI. The Copernican system gave a truer picture than the older Ptolemaic system, which was geocentric, or centred on Earth. The Copernican system correctly described the Sun as having a central position relative to Earth and other planets. Copernicus retained from Ptolemy of Alexandria, although in somewhat altered form, the imaginary clockwork of epicycles and deferents (orbital circles upon circles), to explain the seemingly irregular movements of the planets in terms of circular motion at uniform speeds.
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