Night Light of Chatham (Illinois) from space (United States) Src. Average luminocity for 10x10km area is 27.5958% and for 50x50km: 12.0102%.
Square area 10x10 km:
 1.3%
 1.3%
 4.71%
 2.44%
 3.9%
 4.38%
 10.55%
 6.82%
 8.93%
 25.81%
 29.87%Square area 50x50 km:
 2.11%
 2.02%
 1.49%
 1.51%
 1.69%
 1.61%
 1.98%
 1.67%
 3.1%
 5.01%
 77.81%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
40° 12' 54.8" North, 90° 24' 27.6" West
39° 40' 34.2" North, 89° 42' 16.3" West
39° 7' 58.3" North, 89° 0' 5.1" West
Some cities around Chatham sort by population:
• Springfield
		14.9 km =9.3 mi, 
20°
• Jacksonville
		45.3 km =28.1 mi, 
278°
• Lincoln
		60 km =37.3 mi, 
28°
• Taylorville
		37.9 km =23.5 mi, 
111°
• Litchfield
		55.9 km =34.7 mi, 
175°
• Hillsboro
		60 km =37.3 mi, 
162°
• Carlinville
		46.6 km =29 mi, 
199°
• Pana
		62.4 km =38.8 mi, 
120°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016