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🔶The concept of Indian Standard Time was accepted in the country on September 1, 1947.

IST is observed throughout the country, with a time offset of UTC + 5.30. IST means that India is five and a half hours ahead of Greenwich Mean Time. 

📝How is it calculated?
- India does not follow Daylight Saving Time, like other countries in the world.
- IST is calculated on the basis of 82.5 degrees East longitude from a clock tower in Mirzapur near Allahabad, as it is near the corresponding longitude reference line.

◾️History
- During the British Raj in 1884, India used to have two time zones, Bombay time and Calcutta time.

- The ancient Indian astronomy divided the time measured from the onset of the sunrise into smaller time units equalling one prana (time span of one breath which is 4 seconds). 15 breaths equaled a minute.

🔶The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc.
Historians do not fully agree on its starting and ending points, but the period is generally considered to span from the announcement of the Truman Doctrine on 12 March 1947 to the dissolution of the Soviet Union on 26 December 1991. The term cold war is used because there was no large-scale fighting directly between the two superpowers, but they each supported major regional conflicts known as proxy wars.
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An Intiative of Subject experts .
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