Night Light of Gahanna (Ohio) from space (United States) Src. Average luminocity for 10x10km area is 93.4805% and for 50x50km: 54.1611%.
Square area 10x10 km:
 37.82%
 39.45%
 10.39%
 6.17%
 6.17%
 0%
 0%
 0%
 0%
 0%
 0%Square area 50x50 km:
 16.8%
 14.74%
 5.8%
 6.47%
 6.36%
 4.68%
 3.96%
 4.31%
 6.85%
 8.06%
 21.97%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
40° 33' 20.1" North, 83° 34' 56.9" West
40° 1' 9.2" North, 82° 52' 45.6" West
39° 28' 43.1" North, 82° 10' 34.4" West
Some cities around Gahanna sort by population:
• Columbus
		12.1 km =7.5 mi, 
237°
• Westerville
		12.6 km =7.8 mi, 
340°
• Reynoldsburg
		9.2 km =5.7 mi, 
141°
• Whitehall
		5.9 km =3.7 mi, 
185°
• Bexley
		7.5 km =4.7 mi, 
221°
• New Albany
		9.1 km =5.7 mi, 
41°
• Blacklick Estates
		12.8 km =8 mi, 
174°
• Grandview Heights
		14.4 km =8.9 mi, 
252°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016