In ancient geocentric theory, Earth was the middle of the universe, and the physique round which the Sun and planets revolved. After Galileo ( ) constructed a telescope and turned it toward the heavens, proof supporting a heliocentric model started to accumulate. Through his refracting (using lenses to kind images), Galileo saw that Venus and Mercury go through phases similar to those of the Moon.
The historical Greeks believed that the motions of the planets had been round, a view that was not challenged in Western tradition until the 17th century, when Johannes Kepler postulated that orbits had been heliocentric and elliptical (Kepler’s first regulation of planetary motion). Because the Earth isn’t the center of the universe, it will make sense that discrepancies within the geocentric concept would begin to show up in some later measurements. Once the Greeks started to note some anomalies between projected areas of the planets … Read More