The opposite of vertical, something horizontal is arranged sideways, like a person lying down. When you sleep (unless you’re a horse), your body is horizontal: horizontal things are parallel to the ground or running in the same direction as the horizon. If you stack books horizontally, then they’re on their side.

Are horizontal and vertical directions?

Conversely, a direction or plane is said to be horizontal if it is perpendicular to the vertical direction. … In general, something that is vertical can be drawn from up to down (or down to up), such as the y-axis in the Cartesian coordinate system.

Does horizontal mean left to right?

Anything parallel to the horizon is called horizontal. … So, the horizontal line is one that runs across from left to right.