Additional material:
How the planets rotate in our solar system(video, 2.5 MB)
The strange loops of the planets (video, 0.6MB)
How to find the pole star (video, 5MB)
The ‚time-equation'(video, 2.8MB)
The orbit of the moon(video, 4.6MB)
G. Glaeser – Astronomy based on monumental buildings of ancient civilizations (German)