Night Light of Perambalur (Tamil Nadu) from space (India) Src. Average luminocity for 10x10km area is 37.29% and for 50x50km: 8.127%.
Square area 10x10 km:
 0.65%
 8.01%
 6.28%
 3.25%
 3.03%
 7.58%
 10.82%
 7.36%
 8.66%
 38.1%
 6.28%Square area 50x50 km:
 0.13%
 0.86%
 0.97%
 0.77%
 0.76%
 1.38%
 2.33%
 2.22%
 2.53%
 6.59%
 81.46%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
11° 55' 19.7" North, 78° 10' 48.8" East
11° 13' 60" North, 78° 52' 60" East
10° 32' 34.3" North, 79° 35' 11.3" East
Some cities around Perambalur sort by population:
• Turaiyūr
		32.4 km =20.1 mi, 
253°
• Ariyalūr
		23.5 km =14.6 mi, 
116°
• Arumbāvūr
		23.5 km =14.6 mi, 
314°
• Gangavalli
		38.9 km =24.2 mi, 
319°
• Vīraganūr
		31.4 km =19.5 mi, 
329°
• Pullambādi
		32.6 km =20.3 mi, 
174°
• Uppiliyapuram
		40.4 km =25.1 mi, 
274°
• Māttūr
		36.2 km =22.5 mi, 
74°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016