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The Celestial Sphere
- General Reference Sites: Cornell University page;
Indiana University page;
University of Tennessee page.
- Visualization: MathPages animation of stars up to magnitude 3.5.
Motions on the Celestial
Sphere
- Planet Retrograde Motion: Science U page;
La Salle University page.
- Planet Oppositions: Mars page.
- The North Star: Why the North Star Stands Still legend.
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