Geographic basemap
OpenFreeMap vector tiles + OpenStreetMap provide geographic context for coordinate exploration.
Interactive map
Check Tonight first. Explore locations second.
Explore geographic context, reference cities, and coordinates on the dashboard map, where the Bortle context is modelled from city and dark-sky anchors. The annual satellite light-pollution tiles are not shown because their source, reuse, and processing records cannot be verified.
Decision first
Tonight separates forecast inputs, observations and unavailable values.
Modelled darkness
The dashboard provides a modelled Bortle estimate from city and dark-sky anchors. SQM/NELM details are entitlement-gated; no measured light-pollution layer is active while tile provenance remains unverified.
Source boundaries
The interface labels live deliveries, forecasts, models and editorial guidance separately.
Free planning
Check tonight before you choose a place
Start with the free tonight check for current forecast context, then use the map to explore geographic locations. Measured light-pollution tiles remain unavailable until their source and processing history can be verified.