Question

W WHICH LONGITODE I known
As PRIME MERIDIAN OF
TNDIA​

Answer 1

Greenwich Meridian (Prime Meridian)

It's also called the Prime Meridian. This line is the starting-point for longitudinal lines that run north-south and converge at the poles. The Greenwich Meridian (or prime meridian) is a 0° line of longitude from which we measure 180° to the west and 180° to the east.

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Answer 2

Answer:

To avoid this confusion a longitude passing through the midpoint of 68o 7' East (western most longitude) and 97o 25' East (eastern most longitude) is taken as the standard prime meridian of India (i.e. 82o30')