COMBINED STATE AGRICULTURAL SER‐ Indian Standard Time (IST) is calculated based on the meridian of longitude that is closest to the country's geographic center and lies on the east of the Prime Meridian. For India, this is 82° 30′ East longitude. The extent of India from North to South, measured from the northernmost point in Kashmir (Indira Col) to the southernmost point on the mainland (Cape Comorin or Kanyakumari), is approximately 3,214 kilometers.