The Signals are based on atomic clocks and synchronised with the worldwide program of clocks that support Coordinated Universal Time. India's time zone is predicated to the eighty two.five°E meridian, which passes by Mirzapur. The half-hour offset was picked to keep the time close to the indicate solar time across https://psttoist75979.wikibestproducts.com/2489309/ist_time_now_no_further_a_mystery