All About History
Copernicus publishes his heliocentric theory
1543, Frombork, Poland
Mathematician and astronomer Nicolaus Copernicus published his book On the Revolutions of the Heavenly Spheres, revealing his heliocentric theory, an astronomical model that placed the Sun at the centre of the universe. The book, published just before his death, triggered the Copernican Revolution that saw scholars move away from the traditional Ptolemaic model – with Earth at the centre – to the heliocentric one, transforming the way the universe was understood.