Question:
Why 82°30'E has been selected as the Standard Meridian of India?
( Chapter - 1 India-Size and Location, Cass 9 NCERT Contemporary India -II )
Answer.
It is difficult to prepare a separate local time for each longitude, so for convenience, we have a standard meridian. So, we can say, the standard meridian of the country is selected for marking the time zone of the country.
Although India has only one standard meridian ( 82°30'E) but many countries which has a larger longitudinal extent have more than one time zone or standard meridian.
For example,
- Canada (which has 6 time zones)
- the USA (which has 6 time zones)
- Russia (which has 11 time zones)
The longitudinal extent of mainland India is between 68°7'E and 97°25'E which is about 30°. That is why, From Gujarat to Arunachal Pradesh, there is a time lag of two hours( 30*4=120 minutes=2 hours).
To avoid other problems arising from many time zones, there is only one time zone in India. There is also an international understanding among the countries of the world to select the standard meridian in multiples of 7°30' (30 minutes of time) of longitude, which is why the standard meridian of India has been selected 82°30'E ( Passing through Mirzapur, Uttar Pradesh), it is nearly middle of 68°7'E and 97°25'E. And it passes almost in the middle of India.
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