Astronomy
                                 
                                    8A00.00- PLANETARY ASTRONOMY
                                    
         8A05.00 – Historical Astronomy
         8A10.00 – Solar System Mechanics
         8A10.25 - Phases of the Moon
         8A10.55 - Retrograde Motion Model
         8A10.80 - Celestial Sphere
         8A20.00 – Earth-Moon Mechanics
         8A30.00 – Views From Earth
         8A35.00 – Views From Earth-2
         8A40.00 – Planetary Properties: Globes, Hemispheres, & Maps
         8A50.00 – Planetary Properties -2: The Planets
         8A60.00 – Planetary Properties – 3: Planetoids, Minor Objects
         8A70.00 – Planetary Properties – 4: Planetary Characterstics
         8A80.00 – Planetary Properties – 5: Comets and The Search For Life
 
                                    8B00.00- STELLAR ASTRONOMY
                                    
         8B10.00 – The Sun
         8B20.00 – Stellar Spectra
         8B30.00 – Stellar Evolution
         8B40.10 – Black Holes Surface
         8B40.20 - Membrane Table
         8B50.00 – Stellar Miscellaneous
 
                                    8C00.00- COSMOLOGY
                                    
          8C10.10 – Expanding Universe
          8C20.00 – Gravitational Effects
 
                                    8D00.00- MISCELLANEOUS
                                    
          8D10.00 – Miscellaneous Astronomy
 
                                    8E00.00- ASTRONOMY TEACHING TECHNIQUES
                                    
          8E30.00 – Techniques and Projects