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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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compendium: several instruments compiled into one device; also see article on astronomical compendium.
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conjunction: two planets having the same position (in longitude) in the ecliptic are said to be in conjunction. This relative position had important astrological significance.
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cross-staff: instrument for measuring angles between distant objects, mostly altitudes, see article on cross-staff.
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cross-staffs: see article on cross-staff
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crucifix dial: form of polyhedral sundial in the shape of a crucifix, see article on sundial.
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