Reference information --- comets and their observations

1. THE PHYSICS OF COMETS
   1. Nucleus
   2. Coma
   3. Comet tail
      1. Ion tail
      2. Dust tail
   4. Photometric behaviour of comets
      
      1. Photometric behaviour of short-period comets
      2. Photometric behaviour of long-period comets
2. VISUAL OBSERVATIONS OF COMETS
   1. Choosing a location for visual observations of comets
      1. Observation location accessibility
      2. The terrain and the openness of the horizon
      3. Light pollution
         
         1. The brightness of the sky background and its determination (SQM)
         2. Light pollution color scale
         3. Bortle scale
         4. Limiting magnitude of the objectvisible with the naked eye
   2. Tools for visual observations of comets
   3. Visual magnitude estimates
      1. Methods
         1. Morris's method
         2. Sidgwick method
            
            1. "Modified" Sidgwick method
         3. Beyer's method
         4. Bobrovnikoff's method
         5. The in-focus method
         6. Naked-eye magnitude estimates
      2. Sources of comparison star magnitudes for the visual observations of comets
      3. Magnitude corrections for atmospheric extinction
   4. Coma-diameter estimates
   5. Coma's degree of condensation
      
   6. Measuring length and a position angle of comet's tail
3. USING A COMETBASE
   1. Registration
   2. News mailing list
      1. Subscribe to new observations
      2. Subscribe to cometary news
   3. Personal cabinet
      1. Settings
      2. Personal information
      3. Personal list of tools
      4. Personals list of oculars
      5. Observation places
      6. Personal list of comets
      7. Personal observations
   4. Submitting personal observations
      1. Submitting observations one at a time
      2. Bulk uploads of observations
   5. Terms and conditions