because they are parallel to the plane of the horizon
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On the globe they are called lines of LATITUDE and are parallel to the equator.
utx
gradient
horizontal lines are lines which may be at the angle of 00,1800,3600.if vertical lines stand on horizontal lines it is in the angle of 900
In general, they are called horizontal lines, but they will only be that if they have a zero slope. They'll be "level" or "flat" lines.