1. The prime meridian of longitude is in Greenwich, South London.

2. Ptolemy was free, however, to lay his prime meridian, the zero-degree longitude line, wherever he liked.

3. The placement of the prime meridian is a purely political decision.

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4. Starts to the prime meridian, becomes the world coordinates.

5. Yes this is the...is the prime meridian if you like. The line that separates the eastern hemisphere from the western hemisphere.

6. Yes this is the...is the prime meridian if you like.

7. He said: "I just crossed the Prime Meridian and reached the Western Hemisphere!

8. The prime meridian is at 0 degrees longitude, and the international date line is at 180 degrees. The equator is at 0 degrees latitude.

9. So the martian prime meridian, the equivalent of the Greenwich, UK, prime meridian on Earth, has been set to run through this region.

10. Minus sign indicates west of prime meridian in longitude and south of equator in latitude.

11. By agreement, the longitude passing through Greenwich of Observatory is called the prime meridian.

12. Longitude values are indicate the angular distance between the Prime Meridian and points east or west of it on the surface of the Earth.

13. Greenwich thus became established as the location of the prime meridian of longitude, and the base line for calculating time zones around the world.