earth sun and moon

Aristotle-

- Proposed the geocentric model, placing Earth at the centre of the universe.

- Believed that celestial bodies moved in perfect circles and that the heavens were unchanging.

- His ideas were influential for centuries, shaping early astronomical thought.

Aristarchus-

- Suggested a heliocentric model centuries before Copernicus, proposing that the Sun, not the Earth, was at the centre.

- Although his ideas were not widely accepted at the time, he calculated relative distances to the sun and moon.

- His work laid the groundwork for later heliocentric theories by challenging the prevailing geocentric view.

Ptolemy-

- Expanded the geocentric model in his work "Almagest," introducing complex systems of epicycles to explain planetary movements.

- His model accounted for observed retrograde motion of planets and was mathematically sophisticated for its time.

- The Ptolemaic system dominated astronomy for over a thousand years, illustrating the resistance to change in scientific models.

Copernicus

- Formulated a comprehensive heliocentric model in his book "De revolutionibus orbium coelestium."

- Argued that the sun was at the Center of the universe and that Earth and other planets orbited around it.

- His ideas prompted a major paradigm shift in astronomy, leading to the eventual acceptance of heliocentrism and revolutionizing scientific inquiry.