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. A measured light-pollution layer is not currently shown because the available tiles do not carry enough source and processing metadata to verify their lineage. Any modelled darkness estimates are labelled separately from satellite measurements.
Decision first
Tonight separates forecast inputs, observations and unavailable values.
Modelled darkness
Bortle class and SQM estimates from calibrated city-light-dome anchors and dark-sky references. Use as a planning guide.
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.