Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. This model positioned the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds. The Copernican model displaced the geocentric model of Ptolemy that had prevailed for centuries, which had placed Earth at the center of the Universe. Copernican heliocentrism is often regarded[by whom?] as the launching point to modern astronomy and the Scientific Revolution.
Heliocentric model from Nicolaus Copernicus' De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres)
Although he had circulated an outline of his own heliocentric theory to colleagues sometime before 1514, he did not decide to publish it until he was urged to do so late in his life by his pupil Rheticus. Copernicus's challenge was to present a practical alternative to the Ptolemaic model by more elegantly and accurately determining the length of a solar year while preserving the metaphysical implications of a mathematically ordered cosmos. Thus, his heliocentric model retained several of the Ptolemaic elements, causing inaccuracies such as the planets' circular orbits, epicycles, and uniform speeds,[1] while at the same time introducing such innovative ideas as:-
The Earth is one of several planets revolving around a stationary sun in a determined order.
The Earth has three motions: daily rotation, annual revolution, and annual tilting of its axis.
Retrograde motion of the planets is explained by the Earth's motion.
The distance from the Earth to the Sun is small compared to the distance from the Sun to the stars.
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Answer:
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Answer:
The correct answers are:
movable type – carved letters arranged in a tray and used for printing
currency – money used by a country
unity – to bring people or things together
porcelain – a very delicate form of white ceramic
jade – a green stone often used in carvings
Explanation:
Movable type is a printing system that consists of various movable components (carved letters arranged in a tray and used for printing) which reproduce a written material on a paper.
Currency represents any kind of money (coins or paper) used within a certain country to pay for goods and services. Its function is to allow the trade between two countries and make it simpler and easier.
Unity is a concept that supposes bringing people or things together by combining all its parts into one.
Porcelain is a type of white ceramic material found in China made by the heating process. It is often used for the fabrication of decorative objects and different types of working equipment.
Jade is a green mineral used to produce carvings, tools, gemstones, jewelry,etc.
