"Version: 20201201"--Title page verso.Includes bibliographical references.Prologue : we all are online astronomy instructors -- Guidelines for teaching astronomy online / Melody Buckner, Josie Strahle and Stephanie Tammen -- Who are we teaching online, and why? / Matthew Wenger -- Effective course design / Adrienne J Gauthier -- Astronomy education in virtual worlds and virtual reality / Anthon…