Night Light of Vandalia (Illinois) from space (United States) Src. Average luminocity for 10x10km area is 16.2938% and for 50x50km: 2.0091%.
Square area 10x10 km:
 1.79%
 2.27%
 2.76%
 2.44%
 2.27%
 2.11%
 1.3%
 0.49%
 3.41%
 9.42%
 71.75%Square area 50x50 km:
 0.1%
 0.2%
 0.3%
 0.28%
 0.31%
 0.31%
 0.32%
 0.43%
 0.44%
 0.72%
 96.59%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 30' 18.8" North, 89° 47' 48.5" West
38° 57' 38.2" North, 89° 5' 37.2" West
38° 24' 42.3" North, 88° 23' 26" West
Some cities around Vandalia sort by population:
• Centralia
		48.6 km =30.2 mi, 
184°
• Effingham
		50.7 km =31.5 mi, 
69°
• Highland
		55.7 km =34.6 mi, 
243°
• Salem
		39.3 km =24.4 mi, 
160°
• Litchfield
		54 km =33.6 mi, 
296°
• Greenville
		28.7 km =17.8 mi, 
254°
• Hillsboro
		41.2 km =25.6 mi, 
302°
• Pana
		47.6 km =29.6 mi, 
1°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016