Encyclopedia of scientific dating methods
He considered the motion of a body through a resisting medium as proportional to the force producing the motion and inversely proportional to the resistance of the medium.Aristotle used this relationship to argue against the possibility of the existence of a void, for in a void resistance is zero, and the relationship loses meaning.
In the heliocentric theory, this effect is ascribed to a change in Earth’s rotational axis, which traces out a conical path around the axis of the orbital plane.The , in formulating his cosmology, adopted Eudoxus’s homocentric spheres as the actual machinery of the heavens.The Aristotelian cosmos was like an onion consisting of a series of some 55 spheres nested about Earth, which was fixed at the centre.One of its principal fields, physics, deals with the most general properties of matter, such as the behaviour of bodies under the influence of forces, and with the...and thereby helped to establish the fundamental principles of classical (that is, pre-20th-century) physics.Greek philosophy answered these questions in terms that provided the framework for science for approximately 2,000 years.
system of arithmetic progressions and methods of approximation by which they were able to predict first appearances.
Using only uniform circular motions, Eudoxus was able to “save” the rather complex planetary motions with some success.
His theory required four homocentric spheres for each planet and three each for the Sun and Moon.
In addition, to account for the daily motions of the heavens, he held that Earth rotates on its axis.
Heracleides’ theory had little impact in antiquity except perhaps on ) made extensive contributions to both theoretical and observational astronomy.
He used this device to account for various irregularities and inequalities observed in the motions of the Sun and Moon.