Danville, IL Night Sky Brightness
Danville, IL's night sky, measured from orbit
Satellite radiance puts Danville in the suburban band. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Danville's sky is brighter than 53.9% of the 3,206 cities in this dataset.
Note the source: a satellite reading of upward light, not a visual Bortle scale reading. The two measure related but different things, explained in the Bortle scale guide.
How far Danville is from a meaningfully darker sky
The closest place in this dataset with a meaningfully darker sky is Mahomet, IL, roughly 41 miles away in a straight line, rated suburban edge. Road distance will be more.
Mahomet, IL is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Danville compares nationally
About 27,981 people live in Danville, IL, sized enough to appear in this dataset of 3,206 incorporated US cities. Danville's position, 1,719 of 3,206, darkest to brightest, comes from the sampling method the methodology guide sets out.