The Prime Meridian is located at exactly 0° longitude.
Longitude of the Prime Meridian line: 0°
Longitude of the Prime Meridian line: 0°
Here’s a quick one: the Prime Meridian sits at exactly 0° longitude. It runs through Greenwich, England, and serves as the universal reference point for measuring east and west.
Primary location of the Prime Meridian: Greenwich, London, United Kingdom
Primary location of the Prime Meridian: Greenwich, London, United Kingdom
This isn’t just any line on a map—it’s the backbone of global timekeeping and navigation. Sitting in Greenwich, England, the Prime Meridian was officially locked in during the 1884 International Meridian Conference Britannica. That decision finally united all those competing national meridians—like the ones in Paris and Stockholm—into one worldwide standard. Beyond geography, it kickstarted the world’s time zone system and powers modern GPS for everything from flights to shipping to your phone’s location services Royal Museums Greenwich. The concept of latitude and longitude lines helps explain how these measurements work together.
Key details about the Prime Meridian
Key details about the Prime Meridian
| Feature | Value |
|---|---|
| Longitude | 0° (exact) |
| Primary Location | Greenwich, London, United Kingdom |
| Coordinates | 51°28′40″N 0°00′05″E (Ordnance Survey Zero Meridian) |
| Opposite Meridian | 180th meridian (International Date Line) |
| Reference System | IERS Reference Meridian (since 1984) |
Now, here’s something most people don’t realize: the Prime Meridian isn’t perfectly lined up with the historic Greenwich Observatory line anymore. Thanks to better measurement tech, the modern standard—the IERS Reference Meridian—sits about 5.3 arcseconds west of where the original observatory marked it IERS.
Historical significance of the Prime Meridian
Historical significance of the Prime Meridian
For centuries, different countries used their own meridians—Paris, Cadiz, and Rome all had versions, which made navigation a nightmare for ships crossing borders. Then came the 1884 conference in Washington, D.C., where the world finally agreed to standardize on Greenwich. They picked it because British maritime charts were everywhere at the time, and the British Empire dominated global trade National Geographic. Honestly, this was the simplest solution that actually stuck. The choice of the Prime Meridian also influenced how we understand longitude measurement today.
Fun detail: the Prime Meridian crosses the Equator in the Gulf of Guinea, creating the (0°,0°) point—the origin for every coordinate system on Earth. What’s wild is that this spot sits in international waters, proving the meridian is a human invention, not some natural landmark NOAA.
Can you visit the Prime Meridian in 2026?
Can you visit the Prime Meridian in 2026?
Absolutely. As of 2026, you’ll find the Prime Meridian at the Royal Observatory Greenwich, a UNESCO World Heritage Site run by Royal Museums Greenwich. You can literally stand on the line, check out the historic Airy Transit Circle, and dive into exhibits on how we measure time and longitude. The place is open daily, and your ticket helps keep the site in top shape. While you’re there, swing by the Cutty Sark, a stunning 19th-century tea clipper, or catch a show at the Peter Harrison Planetarium, which teaches celestial navigation. The observatory also hosts programs for students and researchers studying geodesy and cartography—because this spot is still a major classroom for how we map the planet UNESCO World Heritage.
What is the longitude that is exactly opposite the prime meridian called?
The 180th meridian is the line of longitude that is exactly opposite the prime meridian. It is 180° longitude.
What is the longitude of the prime meridian and where does it pass through?
The Prime Meridian runs through Greenwich, England and is at 0° longitude. For many years, different countries measured longitude from different meridians. The French and Algerians, for example, used the Paris Meridian; the Swedes measured from one that passed through Stockholm. The Prime Meridian’s location in Greenwich became the global standard after the 1884 agreement.
What is the longitude of the prime meridian quizlet?
The Prime Meridian is at 0 degrees longitude. The maximum longitude is 180 degrees, halfway around the world from the prime meridian. A model of a compass. It tells the cardinal directions which are north, south, east and west.
What cities are on the prime meridian?
| Locality Modern longitude Meridian name | Greenwich 0° 00′ 05.33′′ W United Kingdom Ordnance Survey Zero Meridian | Greenwich 0° 00′ 00.00′′ IERS Reference Meridian | Paris 2° 20′ 14.025′′ E Paris meridian | Brussels 4° 22′ 4.71′′ E |
|---|
Why is the prime meridian important?
The prime meridian line runs in Greenwich, London, and England. It is important because it is the starting point for the measuring system called longitude. The prime meridian is also used as the basis for the world’s time zones.
What is known as prime meridian?
The prime meridian is the line of 0° longitude, the starting point for measuring distance both east and west around the Earth. The prime meridian is arbitrary, meaning it could be chosen to be anywhere.
Where is 180 degrees east longitude?
Download coordinates as: KML
The 180th meridian or antimeridian is the meridian 180° both east and west of the Prime Meridian, with which it forms a great circle dividing the earth into the Western and Eastern Hemispheres. It is common to both east longitude and west longitude.
Where is the anti meridian located?
The antimeridian is halfway around the world, at 180 degrees. It is the basis for the International Date Line. Half of the world, the Eastern Hemisphere, is measured in degrees east of the prime meridian. The Prime Meridian and antimeridian create a continuous line around the globe.
What is another name for a meridian quizlet?
The Equator is the most important line of latitude at 0°. It circles the Earth exactly midway between the North and South poles. Meridians is another word for lines of longitude, which are half circles that intersect at the North Pole and the South Pole.
How are the equator and the Prime Meridian used on maps?
By using the equator and prime meridian, we can divide the world into four hemispheres—north, south, east, and west. ... The International Meridian Conference of 1884 changed all that, naming an imaginary line drawn through Greenwich, England, as the prime meridian. These lines are drawn only on maps and globes, however.
What longitude is the International Date Line?
International Date Line
line of longitude at roughly 180 degrees. East of this line is one day earlier than west.
Which city is closest to prime meridian?
Which capital city is closest to the prime meridian? And the answer: London. Like the equator, the prime meridian is an imaginary line that divides the Earth, but instead of running east and west, it runs north and south.
Which city is the closest to the equator?
Quito is the closest capital city to the equator. Quito’s altitude is listed at 2,820 m (9,250 ft).
How many prime meridians are there?
one of Earth’s 24 divisions distinct by one hour, roughly 15 degrees of longitude. area of the Earth west of the prime meridian and east of the International Date Line.
What are 3 facts about meridians?
The Prime Meridian divides the Earth into East/West from the North Pole to the South Pole with an imaginary line along the longitude line of 0°. The Antimeridian, at 180° longitude, connects with the Prime Meridian to form a 3D giant circle all around the Globe, dividing it into Eastern and Western hemispheres. The Prime Meridian’s location in Greenwich was chosen for its historical significance in navigation.
