DWQA Questions › Category: Astronomy › What is Bortle Scale ?
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admin Staff asked 2 years ago

What is the Bortle Scale? How it’s used in Astronomy?
 
 

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admin Staff answered 2 years ago
  • The Bortle Scale is a nine-level numeric scale that rates the night sky’s brightness, or how well celestial objects can be seen, on a scale of 1 to 9.
  • The lower the number, the darker the sky and the better the conditions are for stargazing. A “1” on the Bortle Scale is an excellent, dark sky; a “9” is an urban sky so bright that the Milky Way is barely visible.