PHYS 1600 Chapter Notes - Chapter 2: Orbital Period, Deferent And Epicycle, Gang Of Youths
25 Nov 2016
School
Department
Course
Professor
Document Summary
Unit 1: the planets of the solar system and their motions: sept 8 to sept 18, 2016. Ancient greeks and the geo-centric view of the universe. The belief in a sun-centered cosmology formed slowly: The positions of the planets slowly shift relative to the fixed stars in the constellations. Planets do not move at uniform rates. Planets usually move slowly to the left (eastward) relative to the background stars. This movement is called direct motion or prograde motion. However, occasionally a planet seems to stop and then back up for several weeks or months. This reverse movement (to the right or westward relative to the background stars) is called retrograde motion. Greek astronomer, aristarchus of samos proposed that all of the planets revolve around the sun (heliocentric cosmology/sun-centered). The occasional retrograde movement of a planet is merely the result of our changing view- point as we orbit the sun. Conceptual framework: contains all of the information we take for granted.
