Greenwich mean time [gmt]
It is a function. If the graph contains at least two points on the same vertical line, then it is not a function. This is called the vertical line test.
A line that is at right angles to a vertical line is said to be horizontal.
There is only one set of perpendicular lines in a right triangle; the horizontal line and the vertical line that make it 90 degrees.
The slope of a vertical line is undefined. Horizontal slope is 0.
A vertical line.
eqyator
The vertical line is the Prime Meridian.
A vertical line is 180 degrees.
A vertical line at 90 degrees
vertical calm
Prime Meridian
From the top point to the bottom its 180 degrees
the parallel of latitude 23½ degrees south latitude marking the southern limit of Sun's vertical rays
because 360 degrees is the total amount of degrees you can get. the degrees are essentially the angle measurement. anything that is 180 degrees is a vertical. so vertical angels are used to indicated a 180degree line.
A line 90 degrees from horizontal is a plumb line.
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the prime meridian