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The reference for longitude ... the definition of 'zero' longitude ... is the Prime Meridian.

That imaginary line joins the north and south poles, and runs through Greenwich, a

suburb of London, UK.

Q: What is the reference point for lines longitude and where is it?

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Latitude and Longitude

Latitude and Longitude are used to point to exactly where you want to be

Every point on earth has both a latitude coordinate and a longitude coordinate. That's how you tell people where the point is, even if they're not there.

meridians or lines of longitude

The lines of latitude provide vertical (north-south) coordinates on a map or globe. Lines of longitude provide horizontal (east-west) coordinates. The defined geographical point is where the latitude line intersects the longitude line.

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Latitude and Longitude

Lines of longitude are imaginary vertical lines that represent the angular distance, in degrees, minutes, and seconds, of a point east or west of the Prime Meridian (Greenwich). Lines of longitude are often referred to as meridians. The lines of longitude run from the North pole to the South pole and at the poles all the lines of longitude intersect at a single point.

Lines of latitude and longitude allow a specific point to be located any where on the world.

Yes. The intersection of a line of longitude and a line of latitude is a point on the globe, and that point is identified by the longitude and latitude of those lines.

Every point on a meridian has the same longitude.

All of the meridians of longitude converge at the north and south poles.

First, look on the map to find the line of latitude that the coordinates reference. If the exact line of latitude isn't shown on the map, estimate it by looking at the lines that are available. Then look on the map to find the longitude line that the coordinates reference. Once you have found the two lines, follow them both towards the point where they intersect. That is the location the coordinates reference.

The equator is a latitude reference, not a longitude reference. There is some point on the equator with every possible longitude. The reference for longitude is the Prime Meridian. Longitudes are measured east of it up to 180Â°, and west of it up to 180Â°.

The latitude and longitude references are lines, not points. The reference for latitude is the line that forms a circle and consists of all points with zero latitude. That line is called the "equator". The reference for longitude is the line that forms a semi-circle and consists of all points with zero longitude. That line is called the "Prime Meridian".

The imaginary lines running from north to south on a map are called longitude.

The Equator is the zero reference for latitude.The Prime Meridian is the zero reference for longitude.

If you pick a longitude and mark a dot at every point on Earth with that longitude, the dots will form a line between the north and south poles. The imaginary line is called the "meridian" of that longitude.