Night Light of Vriddhāchalam (Tamil Nadu) from space (India) Src. Average luminocity for 10x10km area is 31.8506% and for 50x50km: 16.9303%.
Square area 10x10 km:
 0.87%
 7.79%
 3.46%
 3.46%
 1.95%
 5.41%
 6.49%
 6.71%
 11.9%
 35.93%
 16.02%Square area 50x50 km:
 1.07%
 3.64%
 2.76%
 1.72%
 1.37%
 2.22%
 3.27%
 3.37%
 5.55%
 8.73%
 66.31%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
12° 12' 23" North, 78° 37' 15.6" East
11° 31' 5.9" North, 79° 19' 26.8" East
10° 49' 42.6" North, 80° 1' 38.1" East
Some cities around Vriddhāchalam sort by population:
• Chidambaram
		42.2 km =26.2 mi, 
108°
• Panruti
		38 km =23.6 mi, 
40°
• Jayamkondacholapuram
		34.3 km =21.3 mi, 
172°
• Kurinjippādi
		29.3 km =18.2 mi, 
83°
• Kīl Bhuvanagiri
		36.3 km =22.6 mi, 
103°
• Pennādam
		15.6 km =9.7 mi, 
215°
• Srīmushnam
		15.7 km =9.8 mi, 
146°
• Māttūr
		25.6 km =15.9 mi, 
211°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016