IST was introduced on 1st Sept, 1947
Bomdila Pass The Indian Standard Time is observed throughout India, with a time offset of UTC+5:30. x) Mirzapur Pr Chilka Lake in
6 Bomdila Pass Indian Standard Time is computed on the basis of 82.5 degrees East longitude from a clock tower in Mirzapur near Allahabad, as it near the corresponding longitude reference line. Mirzapur 1 Chilka Lake in Oris
Jantar Mantar in Jaipur which has large sundials (up to 90 feet high) which were used to accurately calculate local time.
The British East India Company established the Madras Observatory in 1792. uIT
INDIA Being the headquarters of the most important presidencies of British India, Mumbai and Kolkata time assumed importance and began to be adopted by nearby provinces and princely states. Mumbai Kolkata
The International Meridian Conference inwashington in 1884 established uniform time zones for across the wor
The meridian passing east of Allahabad was picked as the central meridian for India. This came into force on 1st January 1906, though Kolkata and Mumbai maintained their own time zone until 1948 and 1955, respectively.
After Independence, on 1st September 1947, the Indian Government declared the Indian Standard Time as the official time for the entire country. The Central Observatory was moved from Chennai to Mirzapur so that it would be closer to the UTC+5:30.