Question

which us the central meridian ​

Answer 1

Explanation:

The central meridian is the center line of longitude for projection systems. Projected coordinate systems often use it as a reference point for a x-origin. For example, the state plane and UTM projection systems use a central meridian. Here are some examples of the central meridian in coordinate systems.82.5º east

British India did not adopt the international standard time zones until 1905 when the meridian passing through Allahabad at 82.5º east (of Greenwich Meridian) longitude was picked as the central meridian for India, corresponding to a single time zone for the country at 5 hours and 30 minutes in advance of GMT.