Night Light of Centralia (Illinois) from space (United States) Src. Average luminocity for 10x10km area is 36.5049% and for 50x50km: 7.154%.
Square area 10x10 km:
 5.68%
 6.82%
 4.87%
 3.41%
 4.38%
 5.03%
 3.25%
 4.71%
 8.77%
 43.67%
 9.42%Square area 50x50 km:
 0.8%
 0.95%
 0.92%
 0.89%
 0.83%
 0.98%
 0.72%
 1.3%
 1.62%
 4.98%
 86.02%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 4' 22.9" North, 89° 50' 11.5" West
38° 31' 30.2" North, 89° 8' 0.2" West
37° 58' 22.3" North, 88° 25' 49" West
Some cities around Centralia sort by population:
• Mount Vernon
		30.6 km =19 mi, 
139°
• Highland
		52.4 km =32.6 mi, 
297°
• Mascoutah
		57.5 km =35.7 mi, 
266°
• Salem
		19.9 km =12.4 mi, 
55°
• Vandalia
		48.6 km =30.2 mi, 
4°
• Greenville
		47.5 km =29.5 mi, 
329°
• Du Quoin
		57.8 km =35.9 mi, 
188°
• Pinckneyville
		54 km =33.6 mi, 
203°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016