Question

From which longitude do all countries begin their count of meridians.​

Answer 1

Answer:

0° longitude

Explanation:

As a result, the International Reference Meridian was established and is commonly used to denote Earth's prime meridian (0° longitude) by the International Earth Rotation and Reference Systems Service, which defines and maintains the link between longitude and time.

hope it's helps you.

Answer 2

Answer:

any line of the longitude can serve as the 0 longitude line