Darby, PA Night Sky Brightness
How dark is the sky in Darby, PA?
Darby's sky measures suburban here. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Only 71.2% of the 3,206 cities measured here read darker than Darby.
Worth remembering: this is satellite radiance, not a ground observation. A true Bortle rating needs a human eye at night, this is the closest large-scale substitute, covered fully in the Bortle scale guide.
Where to go for a darker sky near Darby
Pine Hill, NJ, about 18 miles away as the crow flies, measures in the rural band, one step darker than Darby. Actual driving distance will run longer than that straight-line figure.
Pine Hill, NJ is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Darby against the rest of the dataset
About 10,749 people live in Darby, PA, sized enough to appear in this dataset of 3,206 incorporated US cities. Ranked against the other 3,206 cities here by the methodology guide's own sampling, Darby comes in at 2,271, darkest to brightest.