Lines of longitude are imaginary lines running from the North to the South Poles of the Earth. They are often referred to as Meridians. They are measured in terms of the angular distance east or west from the prime Meridian which runs through Greenwich, England.
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The horizontal lines are called latitudes and the vertical lines are called longitudes.
The dark lines are absorption spectrum, the energy absorbed by Atoms in the atmosphere of the star. ================================ Fraunhofer's spectral lines.
The lines running from north to south are called longitudinal lines or meridians. These lines help to indicate a location's east-west position on the Earth's surface.
Imaginary lines that circle the earth from east to west are called lines of longitude, or meridians. These lines help define the distance east or west of the prime meridian, which is located in Greenwich, England.
meridian :D LoL