Night Light of Blackburn (England) from space (United Kingdom) Src. Average luminocity for 10x10km area is 41.5126% and for 50x50km: 26.6108%.
Square area 10x10 km:
 7.58%
 8.84%
 3.41%
 3.41%
 4.42%
 5.43%
 7.83%
 5.18%
 20.58%
 22.73%
 10.61%Square area 50x50 km:
 4.62%
 5.45%
 2.31%
 3.04%
 4.39%
 3.62%
 3.45%
 3.1%
 7.5%
 16.16%
 46.37%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
54° 9' 49.4" North, 3° 11' 11.3" West
53° 45' 0" North, 2° 28' 60" West
53° 19' 55.8" North, 1° 46' 48.8" West
Some cities around Blackburn sort by population:
• Accrington
		8.2 km =5.1 mi, 
87°
• Darwen
		5.9 km =3.7 mi, 
168°
• Haslingden
		11.7 km =7.3 mi, 
116°
• Great Harwood
		6.3 km =3.9 mi, 
51°
• Padiham
		12.5 km =7.8 mi, 
62°
• Clayton le Moors
		6.8 km =4.2 mi, 
74°
• Longridge
		11.9 km =7.4 mi, 
320°
• Rishton
		5 km =3.1 mi, 
66°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016