Introduction:
The standard meridian is a longitudinal line that is used as a reference point to calculate time and distance, and it is important for mapping and surveying. In India, 82°30'E has been taken as the standard meridian, and there are several reasons for it.

Location:
The 82°30'E longitude passes through the center of India, dividing it into two equal halves. This makes it a convenient reference point for calculating distances and time across the country.

Historical significance:
During the British rule, the 82°30'E longitude was considered as the reference point for the Indian Standard Time (IST), which was set five and a half hours ahead of GMT (Greenwich Mean Time). This tradition continued even after independence, and it is still in use today.

International significance:
The 82°30'E longitude also intersects with the Equator, which makes it an important reference point for global navigation and mapping. It is also used as the reference meridian for the South Asian Association for Regional Cooperation (SAARC) countries.

Consistency:
Having a standard meridian that is universally recognized and accepted is important for consistency and accuracy in mapping, surveying, and timekeeping. By using the 82°30'E longitude as the standard meridian, India is able to maintain consistency with other countries and regions that use this reference point.

Conclusion:
In conclusion, the 82°30'E longitude has been taken as the standard meridian of India for its location, historical significance, international significance, and consistency. It serves as an important reference point for calculating distances and time across the country, as well as for global navigation and mapping.