Prime Meridian
Zero Meridian

Time and geographic space are measured from the prime meridian.

But there was still a hope that a "natural" basis for a prime meridian existed.

They still had to define what the Prime Meridian was.

When doing so, they selected a particular feature for the prime meridian of their charts.

As on the Earth, prime meridians must be arbitrarily defined.

French cartographers would use it as their prime meridian for more than 200 years.

The axis passes through the equator at the prime meridian.

Longitude on the Moon is measured both east and west from its prime meridian.

The Prime Meridian passes to the east of the village.

Mars has a prime meridian, defined as passing through the small crater Airy-0.

Various other prime meridians were in use during the Age of Exploration.

Longitude says how far east or west of the Prime Meridian any place is.

One method is to use the Prime Meridian as the dividing line between east and west.

The only truly accurate benchmarks at that time were near the prime meridian in Europe.

The prime meridian runs 4 to the west.

Geographers today measure these lines from what they call the Prime Meridian.

The Greenwich prime meridian became the international standard reference for cartographers in 1884.

The prime meridian of Mars is defined by the crater Airy-0.

It lies in the northern hemisphere exactly opposite the prime meridian facing the Earth.

You have an appointment with me as often hundred hours prime meridian time, and it is now ten fifteen."

It serves as a reference point with the 0 longitude prime meridian defined to pass through its center.

The Prime Meridian, as the starting point, is 0 (zero) degrees.

The prime meridian passes through the western edge of Bluntisham.

Lourdes is located in the area of the prime meridian in France.

Europa's prime meridian is the line intersecting this point.