Night Light of Harrisburg (Illinois) from space (United States) Src. Average luminocity for 10x10km area is 26.5408% and for 50x50km: 3.6349%.
Square area 10x10 km:
 3.23%
 4.93%
 2.89%
 3.4%
 2.55%
 2.89%
 3.91%
 4.42%
 3.57%
 32.65%
 35.54%Square area 50x50 km:
 0.21%
 0.38%
 0.5%
 0.43%
 0.47%
 0.63%
 0.5%
 0.86%
 0.45%
 1.86%
 93.71%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
38° 17' 32.4" North, 89° 14' 37.5" West
37° 44' 18.2" North, 88° 32' 26.2" West
37° 10' 48.9" North, 87° 50' 15" West
Some cities around Harrisburg sort by population:
• Carbondale
		59.5 km =37 mi, 
268°
• Marion
		34.5 km =21.4 mi, 
268°
• Herrin
		43.4 km =27 mi, 
279°
• West Frankfort
		38.6 km =24 mi, 
297°
• Benton
		44 km =27.3 mi, 
310°
• Mount Vernon
		60.7 km =37.7 mi, 
69°
• Carterville
		47.2 km =29.3 mi, 
272°
• Carmi
		51.6 km =32.1 mi, 
40°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016