In 1508, Nicolaus Copernicus developed a celestial model of a heliocentric planetary system that transformed the way we view the universe. This bold theory, contrary to the geocentric ...

Dallas shows an orrery – a mechanical model of the solar system. Before the 17th century most people believed in a geocentric model of the solar system. Dallas explains the geocentric model and ...

The planets were thought to go around the Earth, in perfectly circular orbits. This so-called Geocentric model was the construction of famous Greek mathematician, astronomer Ptolemy. The model ...