Search results with tag "Bortle dark sky scale"

Introducing the Bortle Dark-Sky Scale - nps.gov

Bortle Dark-Sky Scale Excellent? ... the sky itself. The naked-eye limit is around 5.6 to 6.0, and a 32-cm reflector will reach about magnitude 14.5 to 15.

  Scale, Dark, Bortle dark sky scale, Bortle