Nature of Daylight

• Sky types
  
  
• Availability of daylight
  • Diffuse horizontal illuminance
    • Diffuse horizontal illuminance exceeding 10klx
    • Diffuse horizontal illuminance exceeding 20klx
  • Global horizontal illuminance
    • Global horizontal illuminance exceeding 30klx
    • Global horizontal illuminance exceeding 40klx
  • Probability of certain sky types
    • Frequency of overcast skies
    • Frequency of clear skies
      
      
• The path of the sun
  
  
• Simulating daylighting