De revolutionibus orbium coelestium divided into six "books" (sections or parts), following closely the layout of Ptolemy's "Almagest" which it updated and replaced: Copernicus argued that the universe comprised eight spheres. The outermost consisted of motionless, fixed stars, with the Sun motionless at the center. The known planets revolved about the Sun, each in its own sphere, in the order: Mercury, Venus, Earth, Mars, Jupiter, Saturn. The Moon, however, revolved in its sphere around the Earth. What appeared to be the daily revolution of the Sun and fixed stars around the Earth was actually the Earth's daily rotation on its own axis. Copernicus adhered
The Shadow of the Sun rural villages which gave him an honest perspective on what was the current situation of the continent. The Shadow of the Sun The Shadow of the Sun (, literally "Ebony") is a travel memoir by the Polish writer and journalist Ryszard Kapuściński. It was published by Penguin Books in 2001 with the English translation by Klara Glowczewska. Kapuściński spent nearly 30 years in various African countries such as Kenya, Rwanda, Nigeria, Ethiopia and more, detailing his accounts as a white, foreign visitor, of the development of the African states. Kapuściński's experience in Africa was unique, because he had the opportunity