____________________ proposed a heliocentric model of the solar system
The Heliocentric picture of the solar system is a model because it was given as a theory by Copernicus to describe the solar system. In prior centuries people believed that th…e earth was the center of the solar system. The heliocentric model (the sun at the centre of the solar system - as we now know to be true) was first suggested b…y Aristarchus of Samos in the third century BC, but it wasn't widely accepted until Nicolaus Copernicus presented it again in the 16th century. Heliocentrism is the belief that the sun is the center of the Solar  System and the planet revolve around. The notion was recorded in  the 3rd century , but not until the 16…th century when Copernicus  presented a mathematical model. Copernicus was aware that the ancient Greek Aristarchus had already proposed a heliocentric theory, and cited him as a proponent of it in a reference that was deleted before publication, but there is no evidence that Copernicus had knowledge of, or access to, the specific details of Aristarchus' theory. Aristarchus of Samos in the 3rd century BCE had developed some theories of Heraclides Ponticus (speaking of a revolution by Earth on its axis) to propose what was, so far as is known, the first serious model of a heliocentric solar system. Models of the solar system. In ancient times, it was pretty obvious that the Moon went around the Earth. This was obvious partly because it was and is true. The ancients also noticed the Sun moving around the Earth -- a perfectly reasonable explanation of its apparent motion, and the simplest one available. The Geocentric model of the solar system proposed that the Earth was at the centre of the system (and universe), while the sun and planets revolved around the Earth. We now kn…ow this not to be true and that the sun is at the centre of the solar system (Heliocentric). Heliocentric model from Nicolaus Copernicus' De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres) Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. It positioned the Sun near the center of the Universe, motionless, with Earth and the other planets rotating around it in circular paths modified by epicycles and at uniform speeds. The Copernican model departed from the Ptolemaic system that prevailed in Western culture for centuries, placing Earth at the center of the Universe, and is often regarded as the launching point to modern astronomy and the Scientific Revolution. The Heliocentric Theory was first thought of by Aristarchus of Samos. Heliocentrism is the proposal that the Sun is the center of the Solar System. This opposed the notion of Geocentricism, which suggested that the Earth was the center of the Solar System.
Aristarchus of Samos