Night Light of Derby (Kansas) from space (United States) Src. Average luminocity for 10x10km area is 41.237% and for 50x50km: 23.801%.
Square area 10x10 km:
 3.25%
 4.55%
 6.49%
 6.98%
 6.66%
 8.77%
 6.98%
 6.98%
 14.61%
 31.49%
 3.25%Square area 50x50 km:
 5.13%
 5.02%
 3.59%
 3.13%
 3.75%
 3.24%
 1.88%
 2.67%
 3.61%
 6.7%
 61.29%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
38° 6' 3.5" North, 97° 58' 19.4" West
37° 32' 44.1" North, 97° 16' 8.1" West
36° 59' 9.6" North, 96° 33' 56.9" West
Some cities around Derby sort by population:
• Wichita
		17.4 km =10.8 mi, 
339°
• Andover
		22.1 km =13.7 mi, 
31°
• Haysville
		7.6 km =4.7 mi, 
285°
• Augusta
		30.1 km =18.7 mi, 
58°
• Wellington
		32.5 km =20.2 mi, 
196°
• Park City
		28.6 km =17.8 mi, 
351°
• Valley Center
		33.4 km =20.8 mi, 
344°
• Mulvane
		8.2 km =5.1 mi, 
164°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016