Why is Nagpur called the zero mile centre?

Nagpur is a city in the state of Maharashtra, the largest city in the central India and the third largest city by population in the state of Maharashtra.Nagpur lies precisely at the center of the country with the Zero Mile Marker which indicates the geographical center of India. Nagpur is also a major commercial and political center of the Vidarbha region of Maharashtra, and is famous throughout the country as “Orange City” for being a major trade center of oranges that are cultivated in the region.