Night Light of Jacksonville (Illinois) from space (United States) Src. Average luminocity for 10x10km area is 38.2175% and for 50x50km: 2.7424%.
Square area 10x10 km:
 5.03%
 8.6%
 6.49%
 5.19%
 5.19%
 3.25%
 1.46%
 4.55%
 5.36%
 42.53%
 12.34%Square area 50x50 km:
 0.21%
 0.39%
 0.43%
 0.36%
 0.34%
 0.32%
 0.25%
 0.64%
 0.56%
 2.31%
 94.19%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
40° 16' 21.1" North, 90° 55' 55.7" West
39° 44' 2.2" North, 90° 13' 44.4" West
39° 11' 28" North, 89° 31' 33.2" West
Some cities around Jacksonville sort by population:
• Springfield
		50.6 km =31.4 mi, 
81°
• Godfrey
		86.6 km =53.8 mi, 
177°
• Chatham
		45.3 km =28.1 mi, 
98°
• Taylorville
		82.6 km =51.3 mi, 
104°
• Jerseyville
		68.8 km =42.8 mi, 
187°
• Litchfield
		79.3 km =49.3 mi, 
141°
• Beardstown
		35.7 km =22.2 mi, 
332°
• Carlinville
		58.6 km =36.4 mi, 
149°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016