Ptolemy's contribution to early astronomy was:

He noticed the stars moving in patterns around the night sky, thus predicting the geocentric theory
He noticed the planets in space moving around each other, thus predicting the existence of planetary orbits
He noticed the planets orbiting the space around the sky, thus predicting the existence of multiple galaxies
He noticed the brightest star in the sky does not move during the year, thus predicting the stellar classification system

1 answer

Ptolemy's contribution to early astronomy was primarily the development of the geocentric theory, which posited that the Earth was at the center of the universe and that all celestial bodies, including the stars and planets, revolved around it. Thus, the most accurate statement from your options would be:

He noticed the stars moving in patterns around the night sky, thus predicting the geocentric theory.

His work, particularly in the "Almagest," laid the foundation for astronomical observations and was widely accepted for many centuries until the heliocentric model proposed by Copernicus.

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