Answer :

The first major failure of the ptolemaic theory to predict the results of observations was the phases of Venus. Ptolemy also wrote on a variety of subjects, such as geography, optics, and music.

Ptolemy spent his entire life working furiously, watching the stars and taking meticulous notes. Theon of Smyrna, a renowned mathematician and astronomer in his own right, is likely who educated him. He expanded on the work of earlier thinkers like Hipparchus and Aristotle. A Polish scientist named Nicolaus Copernicus proposed the idea that the Sun is at rest close to the centre of the universe and that the Earth, which rotates once every day, circles yearly around the Sun. The term for this system is heliocentric, or Sun-centered.The B in Speed along an Object's Orbit are Described by Kepler's Second Law. Depending on how far away from the Sun a planet is, it will have a different orbital speed. A planet travels more quickly and experiences a stronger gravitational attraction as it gets nearer to the Sun.

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