The Signals are based upon atomic clocks and synchronised Using the worldwide system of clocks that support Coordinated Universal Time. India's time zone relies to the 82.5°E meridian, which passes by way of Mirzapur. The 50 percent-hour offset was preferred to keep the time near to the mean photo voltaic https://ist-world-clock32448.wikijm.com/2408950/current_ist_time_no_further_a_mystery