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climates: division into latitude zones of the part of the earth known to ancient geographers, used by Ptolemy.
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clinometer: an instrument for measuring inclination.
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common hours: system of hour reckoning, see article on time and date.
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compass: instrument indicating directions by a magnetic needle, see article on compass.
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compass card: card or paper with a printed, drawn or painted compass rose, usually carried above the magnetic needle of a compass.
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compass dial: form of azimuth dial.
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compass rose: diagram of the points of the compass, often decorated and coloured. North is usually indicated by a fleur-de-lys.
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compasses: instrument for drawing circles. see article on drawing instruments.
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