Chapter : 1. Indian Size & Location
(c) Impact of the Longitudinal extent of India :
The earth takes 24 hours to complete one rotation (360º) about its axis. It means the earth rotates at the pace of 15 per hour(360º/24). As the longitudinal extent of India is about 30º longitude, the time lag between easternmost and westernmost points of India is of two hours. When it is 6.00 a.m at eastern extremity. India it is still 4.00 a.m. at the westernmost point of India. To avoid this time confusion, time along the Standard Meridian of India (82º 30ºE) passing through Mirzapur (in Uttar Pradesh) is taken as the standard time for the whole country. The latitude with an odd value of 82º30'E has been selected as the Standard Meridian of India as.
(i) It is well divisible by 7º30', a standard adopted by almost all the countries of the world.
(ii) It lies almost in the middle of India, and as such, it suits us the most.
(d) Impact of the Latitudinal extent of India :
Kanyakumari is situated near Equator. Here days and nights are almost equal, the maximum different is 45 minutes only. But as we move farther towards north or south of the Equator, the difference between the length of the day and night becomes progressively larger. In North Kashmir it is as much as 5 hours, as it is far away from the equator.
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