Why did he invent what he invented? In Copernicus's time, astrology and astronomy were considered divisions of a common subject called "science of the stars," whose main aim was to provide a description of the arrangement of the planets. There was general agreement that the Moon and Sun encircled the motionless Earth, and that Mars, Jupiter, and Saturn were situated beyond the Sun in that order. However, Claudius Ptolemy placed Venus closest to the Sun and Mercury to the Moon, while others claimed that Mercury and Venus were beyond the Sun.
In one of Copernicus's books Commentariolus, Copernicus guessed that if the Sun assumed to be at rest in the middle of the universe, and if the Earth is assumed to be in motion, then the remaining planets fall into an orderly relationship from the Sun as follows: Mercury (88 days), Venus (225 days), Earth (1 year), (Mars 1.9 years), (Jupiter 12 years), and (Saturn 30 years). To accept the theory, you had to develop a new explanation for why heavy bodies or planets fall to a moving Earth.
The people of today use his invention of astronomy to gaze peacefully at the stars. If his invention were not invented the people of today would think that the sun was not in the middle of the universe and the earth is in the middle of the universe.
by: Benjamin T, and Cameron S
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