Q11 of 22 Page 1

What is the longitudinal extent of India? What is its implication?

The longitudinal extent of India is from 68° 7’ E to 97o5’ E. The Earth rotates from West to East. So, the Sun appears to move from East to West. There is a corresponding time difference of one hour for every 15° of longitudinal difference. Due to this, there is local time difference of almost two hours between the extreme Eastern and Western parts of India.

Due to this time difference, one uniform Standard Meridian (82°30’E) has been chosen for India. It is so, that every place in India should have one standard time; that is known as Indian Standard Time (IST).


Thus, by adopting new norms and values and accepting as their own, unity and homogeneity of India has been promoted.


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