<Li> High frequency broadcast service operating at 10 MHz under call sign ATA to synchronise the user clock within a millisecond; </Li> <Li> Indian National Satellite System satellite - based standard time and frequency broadcast service, which offers IST correct to ± 10 microsecond and frequency calibration of up to ± 10; and </Li> <Li> Time and frequency calibrations made with the help of pico - and nanoseconds time interval frequency counters and phase recorders . </Li> <P> IST is taken as the standard time as it passes through almost the centre of India . To communicate the exact time to the people, the exact time is broadcast over the national All India Radio and Doordarshan television network . Telephone companies have dedicated phone numbers connected to mirror time servers that also relay the precise time . Another increasingly popular means of obtaining the time is through Global Positioning System (GPS) receivers . </P>

Through which city does our standard meridian pass