Part of a Blended Classroom taught at Millard West High School. Concepts: What is Revolution (planets) | What is Orbit (planets) | The Ecliptic of the Sun | The Axial Tilt of Earth -------------- 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