According to the above fact CHIDAMBARAM,KANCHI EKKAMBARESHWARAR,AND SRI KALAHASTHI all these three temples lies in the same straight line of LONGITUDE 79DEGREES 41 MINUTES
other two temples THIRUVANNAMALAI, AND THIRUVANAIKKAVAL LIES IN THE SAME LATITUDE.
This is how it is revealed that the CENTER OF EARTH MAGNETIC FIELD LIES AT TOE TIP OF LORD "NATARAJAR"
After so many centuries and after all the technology development it took around 10 years for scholars to prove this .BUT IT HAS BEEN PROVED LONG AGO BY SAINT THIRUMOOLAR, HE HAS MENTIONED ALL THESE FACTS IN HIS "THIRUMANDHIRAM"
http://godsownweb.blogspot.com/2015/08/chidambaram-ragasiyam-secret-behind.html