Question

what is the starting point for numbering the meridians?

Answer 1

This Prime Meridian line runs vertically, north and south, right over the British Royal Observatory in Greenwich England, from the North Pole to the South Pole. As the verticalstarting point for longitude, the Prime Meridian is numbered 0 degrees longitude.

Answer 2

Answer:

the starting point for numbering the meridian is Greenwich meridian at 0 degree