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:
“From Harmony, from heavenly Harmony
This universal Frame began:
From Harmony to Harmony
Through all the Compass of the Notes it ran,
The Diapason closing full in Man.”
—John Dryden (1631–1700)
“Prithee don’t screw your wit beyond the compass of good manners.”
—Colley Cibber (1671–1757)
“Constancy in love is a perpetual inconstancy which fixes our hearts successively to all the qualities of the person loved—sometimes admiring one and sometimes another above all the rest—so that this constancy roves as far as it can, and is no better than inconstancy, confined within the compass of one person.”
—François, Duc De La Rochefoucauld (1613–1680)