![Engraving of Tycho Brahe’s model of the motion of the planet Saturn, from his …[Credits : The Adler Planetarium and Astronomy Museum, Chicago]](http://media-2.web.britannica.com/eb-media/33/6833-004-08AB76E4.jpg)
Engraving of Tycho Brahe’s model of the motion of the planet Saturn, from his Astronomiae instauratae progymnasmata (1602), printed in Prague. Tycho’s geocentric model put the Earth at the centre (A) of the universe, with the Sun (B) revolving around it, and the planets revolving around the Sun.
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