Dark Sky Map
A global dark sky map rating night sky darkness by location, based on the same dark sky scale used to compare stargazing conditions.
Dark Sky Scale (VIIRS satellite data · Classic)
Dark Sky Map FAQ
Here's what this dark sky map shows and how to read it.
What does this dark sky map show?
It displays the estimated darkness of the night sky at any location worldwide, based on satellite-measured light pollution — darker colors indicate less artificial light and better sky visibility.
What is the dark sky scale?
The dark sky scale — also known as the Bortle scale — is a 9-level classification of night sky darkness, from Class 1 (pristine, no light pollution) to Class 9 (heavily light-polluted urban sky).
How is the dark sky scale rating calculated?
Satellite data measuring artificial light radiance is converted into an estimated sky-brightness value, which is then mapped onto the dark sky scale. It's a simplified model, not a precise field measurement — actual conditions vary with clouds, moonlight, and terrain.
What do the different colors on the dark sky map mean?
Each color band corresponds to a range on the dark sky scale — from black/green (Class 1–2, darkest skies) through yellow and orange (Class 5–6, suburban) to red/white (Class 8–9, heavily lit urban areas).
What dark sky scale rating is considered good for stargazing?
Class 1–4 offers minimal light interference and clear views of faint objects like the Milky Way; Class 5–6 still supports viewing planets, the Moon, and brighter stars.
How accurate is this dark sky map?
The ratings are a modeled estimate rather than an on-site measurement — useful for comparing locations and planning ahead, but local factors on any given night can shift actual visibility.
Is this dark sky map limited to certain countries?
No — the dark sky map covers locations globally, so you can check the dark sky scale rating for any city, park, or coordinate on Earth.
