In 1610 Galileo Galilei observed with his telescope that Venus showed phases, despite remaining near the Sun in Earth's sky (first image).
This proved that it orbits the Sun and not Earth, as predicted by Copernicus's heliocentric model, and disproved Ptolemy's geocentric model (second image)..
The heliocentric theory of the Solar System (aka, the heliocentric model) is a theory that places the Sun at the center of the Solar System.
It also maintains that the Earth revolves around the Sun.
The etymology of this term stems from the Greek word for Sun, helios..
Assumptions of the geocentric model
The Earth is the center of the universe and is stationary.
The planets, sun and stars revolve around Earth.
All motions in the sky should follow circular paths as objects are attached to spherical shells..
heliocentrism, a cosmological model in which the Sun is assumed to lie at or near a central point (e.g., of the solar system or of the universe) while the Earth and other bodies revolve around it.Oct 9, 2023.
Galileo knew about and had accepted Copernicus's heliocentric (Sun-centered) theory.
It was Galileo's observations of Venus that proved the theory.
Using his telescope, Galileo found that Venus went through phases, just like our Moon..
Copernican heliocentrism is 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..
Nicolaus Copernicus was a Polish astronomer and mathematician known as the father of modern astronomy.
He was the first European scientist to propose that Earth and other planets revolve around the sun, the heliocentric theory of the solar system..
Essentially, cosmology is the study of how the universe around us works.
Cosmologists study the big bang theory, dark matter, and even dark energy.
Cosmology is similar to astronomy in that space and the universe is studied, but they are two vastly different things.
The BIG BANG THEORY in Cosmology:
The sun and other planets rotate around the Earth, giving us our day and night.
In the heliocentric theory, the Earth rotates around the sun and this is a mechanism that is found throughout the rest of the universe.
The geocentric theory was developed in the early centuries of our BC modern calendar.
The heliocentric version of our solar system is correct as we orbit around the sun.
The geocentric - everything orbiting around the earth - went by the way a long time ago.
We are in a arm of a spiral galaxy (the Milky Way Galaxy) and orbit about the center of that each 233 million years.
Form of astrology based on the heliocentric model
