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12d

#OTD in 1616.

Nicolaus Copernicus's book On the Revolutions of the Heavenly Spheres is added to the Index of Forbidden Books 73 years after it was first published. The book, first printed in 1543 in Nuremberg, Holy Roman Empire, offered an alternative model of the universe to Ptolemy's geocentric system, which had been widely accepted since ancient times.

https://en.wikipedia.org/wiki/De_revolutionibus_orbium_coelestium

About Copernicus at PG:
https://www.gutenberg.org/ebooks/search/?query=copernicus&submit_search=Search

#books #astronomy

Order of the heavenly spheres annotated with periods of revolution from Chapter 10 of Copernicus' manuscript.

At the center of the diagram is the Sol (Sun), around which the planets are arranged in concentric circles. The planets are labeled with their Latin names and their respective orbital periods:

Stellarum Fixarum Sphaera Immobilis (Sphere of the Fixed Stars – the outermost, immobile sphere)
Saturnus (Saturn – 30-year revolution)
Iovis (Jupiter – 12-year revolution)
Martis (Mars – 2-year revolution)
Telluris cum Luna (Earth with the Moon – 1-year revolution)
Veneris (Venus – approximately 9-month revolution)
Mercurii (Mercury – approximately 88-day revolution)

The surrounding Latin annotations provide explanations about the movements of celestial bodies, reinforcing the revolutionary idea that Earth and the planets revolve around the Sun rather than the traditional geocentric (Earth-centered) model.

ALT

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