(Description) Figure 4 De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres), by Copernicus, 1543. His proposition that planets go round the Sun rather than round the Earth was a revolutionary idea that took several hundred years to be accepted.

Week 6: Water on the Moon

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This is an image of an open book, De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres), by Copernicus, 1543.