Question

what is the standard time meridian of india​

Answer 1

82.5 eastern longitude

Answer 2

Answer:

So 82"30 minutes east has been selected as the Standard Meridian Time of India. ... Indian Standard Time is calculated on the basis of 82.30' E longitude, in Shankargarh Fort, Mirzapur (25.15°N 82.58°E) (in Mirzapur district in the state of Uttar Pradesh) which is nearly on the corresponding longitude reference line.

Explanation:

British India did not adopt the international standard time zones until 1905 when the meridian passing through Allahabad at 82.5º east (of Greenwich Meridian ) longitude was picked as the central meridian for India, corresponding to a single time zone for the country at 5 hours and 30 minutes in advance of GMT.

Location of Mirzapur and the 82.5° E longitude that is used as the reference longitude for Indian Standard Time. Indian Standard Time (IST) is the time observed throughout India, with a time offset of UTC+5:30.