Dark Hours
7 hours ago
- The visibility window for good nights in Madison opens at 22:21 and is usable only if you stay local.
- Good nights are rare, clustered, and easy to miss; alerts require leaving an email for notification when launched.
- Submitted data (email and approximate location within ~10 km) is stored for planning and can be unsubscribed with one click.
- Sky conditions depend on light pollution: thin skies allow viewing only bright targets, and the best moment is hindered by Madison's light pollution.
- Madison, located 0 km away, causes the worst light pollution in the southeast direction, with the sky glowing grayish and clusters appearing faint.
- The sky quality model is based on population data (not satellite radiance), cross-validated with RMSE 0.49 mag/arcsec², but biased—real sky is up to one Bortle class darker near mid-size cities.