Question
How is IST calculated?

Answer

  1. In India, for instance, there will be a difference of about 1 hour and 45 minutes in the local times of Dwarka in Gujarat and Dibrugarh in Assam.
  2. It is therefore, necessary to adopt the local time of some Central Meridian of a country as the standard time for the country.
  3. In India, the longitude of 82½°E (82°30E) is located as the standard meridian.
  4. The local time at this meridian is taken as the standard time for the whole country.
  5. It is known as the Indian Standard Time (IST).

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