Question

what did Aristotle in his book on the heavens described

describe that things

Answer 1

Aristotle took it one step further with his observations of motion. Aristotle postulated that all bodies have a natural way of moving, which could be regular or irregular. He believed that everything that moved was moved by something. The latter is only possible when the irregularity of the movement proceeds from either the mover or from the object moved or both. Basically, this is saying bodies could naturally move in a straight line or not all. This idea is actually a rudimentary form of Newton’s first law of motion (an object will remain at rest or in uniform motion in a straight line unless acted upon). He also introduced a third option which was circular motion.

Aristotle noted that the motion of the body moving upward would be fire or air, and downward would be water or earth. This would mean the objects that could be effected by circular motion must be of an exalted substance. Circular motion is connected with more 'heavenly bodies' such as planets. The planets that were allowed to be in circular motion were spheres. These planets revolve around an Earth. He believed the initial motion of the objects was from a 'prime body' who acted on the outermost sphere. Since these spheres are moving in a circular motion, they could neither have weight or lightness as they cannot move naturally or unnaturally towards or away from the centre

Answer 2

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Aristotle in his book On the heavens , was able to put forward two good arguments for believing that the earth was a round sphere rather than a flat plate . First he realized that eclipses of the moon was caused by the earth coming between the sun and the moon .

The earth's shadow on the moon was always round , which would be true only if earth was spherical.

Second , the Greeks knew from their travels that the north star appeared lower in the sky when viewed in the south than it did in more northerly regions .



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