The imaginary line is called the Prime Meridian.
The prime meridian, which is located at 0 degrees longitude and runs through Greenwich, England.
Longitude is measured from the Prime Meridian, the imaginary line running through the observatory in Greenwich, England. The line is therefore also called the Greenwich Meridian.
equator
Longitude is measured in degrees east or west of the Prime Meridian, which is the starting point for the Earth's longitudinal coordinate system. Longitude lines run north-south and indicate positions to the east or west of the Prime Meridian, which passes through Greenwich, England.
The Prime Meridian is the line of 0 degrees longitude, dividing the Earth into the Eastern and Western Hemispheres. Any location east of 100 degrees west longitude falls in the Western Hemisphere because it is measured westward from the Prime Meridian towards the International Date Line. Thus, the half of the map east of 100 degrees west is in the Western Hemisphere.
Fifteen degrees east longitude
The Prime Meridian at 0 degrees longitude divides the Western Hemisphere and the Eastern Hemisphere.
In geography, a meridian is a line of longitude that runs from the North Pole to the South Pole and measures the east-west position of a point on the Earth's surface. The Prime Meridian, located at 0 degrees longitude, is the starting point from which all other meridians are measured.
Longitude !
Longitude is measured in degrees east or west.
Longitude is measured in degrees east or west.
It is neither. The prime meridian is 0 degrees longitude. All other meridians are measured from this. East or west to 180 degrees.
Distance East or West of the prime meridian is measured in degrees of longitude.
the prime meridian
Longitude is the angular measurement in degrees east or west of the Prime Meridian. The Prime Meridian is at zero degrees; going east, your longitude is in degrees and minutes east, while going west your longitude is measured in degrees and minutes west. A circle is 360 degrees, so the maximum longitude is 180 degrees either way. At the 180 degree line (called the "anti-meridian") the measurement is neither east nor west.
The Prime Meridian passes through Greenwich, England. It is designated as 0 degrees longitude and all other meridians are measured in degrees east or west of it. The Prime Meridian was established for navigation and is the basis on which International time is kept.
The divisions of longitude are measured in degrees. The Earth is divided into 360 degrees of longitude, with the Prime Meridian (0 degrees longitude) serving as the starting point. Longitudes range from 0 degrees to 180 degrees east or west of the Prime Meridian, with 180 degrees being the International Date Line.
Longitude
That is called the 'Prime Meridian'.
It is fifteen degrees East. (15 degrees East of the Prime Meridian. The Prime Meridian being zero longitude).