why 82 degree 30 east has been selected as the standard meridian of india?

The 82 degrees and 30 minutes longitude passes through the middle of India and has been selected as the Standard Meridian which determines the time for the whole country .

  • -5

It is actually 82 1/2 ° E.

There are two reasons for taking 82 deg 30 min as the standard meridian:

1. it comes on the multiple of 7 deg and 30 min i.e. 7-30X15=82 deg 30min ie 30 minutes

2. it exactly lies in the middle of india ie 68 deg 7 min + 97 deg 25 min divided by 2= 82 deg 30 min

  • 36

The longitudinal extent of India is 30 degrees. The sun rises in the east and sets in the west. It takes 4 minutes for the sun to move across 1 longitude. Thus the eastern most point of India would be 2 hours ahead of the western most point (30X4=120 minutes) , in accordance with the local time. This difference in time might create a lot of confusion in air, rail timings and so many other things. To avoid this confusion a longitude passing through the mid point of 68 degrees 7 minutes (western most longitude) and 97 degrees 25 minutes (eastern most longitude) is taken as the standard prime meridian of India. The time at the standard meridian 82 degrees 30 minutes which passes through Mirzapur in UP is taken as the standard time of India , followed all over the country.

  • 119

their is a time lag of 2 hrs between east and west states ,to remove this difference and to bring uniformity in time we have considered the standard  meridian of india 82 deg 30 min east.

  • 32

The longitudinal extent of India is 30 degrees and it takes 4 minutes for the sun to move across 1 degree of longitude during the earth's rotation. Thus the eastern most point of India would be 2 hours ahead of the western most point, in accordance with the local time. This difference in time might create a lot of confusion in travel arrangements and other logistical problems. To avoid this confusion a longitude passing through the mid point of 68 degrees 7 minutes (western most longitude ) and 97 degrees 25 minutes (eastern most longitude ) is taken as the standard prime meridian of India . This happens to be 82 degrees 30 minutes which passes through Mirzapur in UP which is taken as the standard time of India.

  • 25

This meridian has been chosen because it passes roughly through the centre of the latitudnal extent.

  • -27
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