Question

how is the standard meridian of india calculated

Answer 1

82.3°E is the longitude which passes through India and divides the country in approximately half.  Due to the county's vastness, sunrise and sunset are earlier in A&N islands and in Arunachal Pradesh and slower in Lakshadweep, Rajasthan and Gujarat. To cope up with this time difference, 82.3°E has been made as standard meridian.

Answer 2

The standard meridian of India is calculated as follows:

• The longitudinal extent of India is '30 degrees' and it takes 4 minutes for the sun to move across 1 degree of longitude.

• Longitudinal extent of India is from "68° 7' 53" E to 97° 24' 47" E which is a closest multiple of 7.5° is 82.5°. So 82"30 minutes east is the Standard Meridian time of India.

• Easternmost point of India would be '2 hours' ahead of the 'westernmost point'.

• This occur by '82 degrees' and '30 minutes' which travel through 'Mirzapur which is taken as the 'standard time of India'.

• The longitude in Mirzapur which is a state in Uttar Pradesh is taken as a reference longitude for the calculation.

• GMT refers to Greenwich Mean Time and the Greenwich of India is Ghamapur.

• The meridian is taken in note to get an idea about the standard time.

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