Question

what do you mean by standard meridian?why is it necessary to have standard maridian

Answer 1

meridian used for determining standard time ... as we know the earth is 360 degree round or it has 360 longitudes. One rotation of earth takes 24 hours or you can say 15 degree in one hour or 1 degree in 4 minuets. We calculate the works time from Prime meridian that that located in Greenwich london. every place on earth has its local time and at every 1 degree the change is of 4 minutes. According to this Indian longitudenal distance is 30 degree means 2 hours difference from East to west ( Arunachal Pradesh to Gujarat). so 2 hours difference is very big that y India made its Standard meridian at Naini Allahabad exact between longitude that is 82 degree 30” east and 7.5 multiples of Prime meridian. so. we reduced the one hour difference in time. Though it’s also long but we are trying to make two meridians because in the far east of India sun sets very early then other places of India. So The significance of Standard meridian is to manage time difference in the country.

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Answer 2

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The time of a place depends on the longitude that passes through it. Therefore, the standard time for each country is usually taken as the time of the central meridian that passes through it.Thus, we need a standard meridian for the country. In India 82 ½ °E longitude determines the standard time.