Part of a Blended Classroom taught at Millard West High School. Concepts: Heliocentric View of the Universe | Geocentric View of the Universe | Why Retrograde Motion changes Views changed our view of the sky YouTube -------------- Produced for Millard Public Schools by Justin Higgins. Lesson Plans and how the course is structured: http://sciencewithhiggins.com/classes/astro/index.html Released under a Creative Commons 4.0 International license