Celestial Navigation Courses
Harvard University via edX Desentrañar el firmamento – Introducción a la Astronomía
Universidad de Murcia via Miríadax Basics of Astronomy
Study.com DSST Astronomy: Study Guide & Test Prep
Study.com Introduction to Astronomy: Certificate Program
Study.com Astronomy for Teachers: Professional Development
Study.com Backyard Astronomy
Udemy Our Night Sky
The Great Courses Plus Earth Science - Patterns in the Night Sky
Spahn's Science Lectures via YouTube Astronomy - The Night Sky
Michel van Biezen via YouTube