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References to 'Celestial Sphere'
1. celestial coordinate system by bloftin
2. Celestial Poles by bloftin
3. celestial sphere and zenith example problem by bloftin
4. equatorial coordinate system by bloftin
5. opposition by bloftin
6. retrograde motion by bloftin
7. sidereal time by bloftin
8. The length of the day by bloftin

Testing some escape charachters for html category with a generator has an injective cogenerator" now escape ” with "