Details Title: Astro. Test 1 Description: Chap 4 Total Flash Cards: 5 Created: 02/18/2009 16:16:48		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Astronomy Flashcards
Cards in this set: Term what is the occasional westward movement of the eastward moving planets is called what? what planet has the most notable of this motion? what did people who believed in the geocentric motion think this was caused by? what is it really caused by? Definition retrograde motion, mars epicycles/deferent of planets, the fact that the earth orbits faster Term what is the epicycle system of motion called? Definition ptolemaic system Term who formed the heliocentric model? who found the arrangements of the planets? Definition aristarchus, copernicus Term who found that planet's move in an elipse? Definition kepler Term what did copernicus do? Definition find p^2=a^3