ASTRON 1F03 Lecture Notes - Lecture 1: Geocentric Model, Deferent And Epicycle, Heliocentrism
12 Mar 2018
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Motion of planets: move with respect to xed stars, change in brightness, change in speed, have retrograde motion : apparent motion of a planet in the opposite direction compared to other objects in the system, aristotele"s geocentric model: Earth in the center => could not explain differences in brightness an most important in retrograde motion: ptolemaic geocentric model: Planets orbit the earth in a deferent( orbital path) and as they revolve on this deferent they also revolve in a path called the epicycle (circle,) whose center moves along the deferent trajectory. !1 marted 18 ottobre 2016: copernicus heliocentric model: Sun is in the centre, planets orbit around. Could explain venus motion and it is simpler: galileo"s discoveries: As a result of this, although the force exerted from the sun to the earth is equal to the one from earth to sun, the sun does not feel the attraction. But it does minimally orbit the common centre of mass.
