Compass
A compass is a navigational instrument that measures directions in a frame of reference that is stationary relative to the surface of the earth. The frame of reference defines the four cardinal directions (or points) – north, south, east, and west. Intermediate directions are also defined. Usually, a diagram called a compass rose, which shows the directions (with their names usually abbreviated to initials), is marked on the compass. When the compass is in use, the rose is aligned with the real directions in the frame of reference, so, for example, the "N" mark on the rose really points to the north. Frequently, in addition to the rose or sometimes instead of it, angle markings in degrees are shown on the compass. North corresponds to zero degrees, and the angles increase clockwise, so east is 90 degrees, south is 180, and west is 270. These numbers allow the compass to show azimuths or bearings, which are commonly stated in this notation.
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Famous quotes containing the word compass:
“It is not for man to follow the trail of truth too far, since by so doing he entirely loses the directing compass of his mind.”
—Herman Melville (1819–1891)
“The statue is then beautiful when it begins to be incomprehensible, when it is passing out of criticism, and can no longer be defined by compass and measuring-wand, but demands an active imagination to go with it, and to say what it is in the act of doing.”
—Ralph Waldo Emerson (1803–1882)
“be a while our guests:
For stars, gaze on our eyes.
The compass love shall hourly sing,
And as he goes about the ring,
We will not miss
To tell each point he nameth with a kiss.”
—William Browne (1591–1643)