What this site is

DarkSkyCheck reports a city-level sky-brightness band derived from NOAA/EOG's public VIIRS satellite radiance dataset. It is informational only and is not a Bortle class, a weather forecast, or a guarantee of what will be visible from any specific location on any specific night.

No warranty on the figures

Every figure traces to the named dataset in the methodology guide, but a satellite measurement is not a promise: moonlight, cloud cover, elevation, and an individual's own night vision all move what a person actually sees, and none of those are in this dataset. Nothing on this site should be the sole basis for travel plans, an equipment purchase, or a property decision.

No professional advice

Nothing on this site is astronomical, environmental, or real-estate advice. Anyone planning an observation trip around a specific event should also check a live weather and Moon-phase forecast for that night, not this site alone.

Content and links

Site content and its presentation of the underlying data are the property of DarkSkyCheck unless otherwise noted. External links are provided for convenience; DarkSkyCheck does not control and is not responsible for third-party sites it links to.

Changes

These terms may be updated as the site changes. Continued use after an update means you accept the current version.