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36 to 49 of 227 glossary terms
climates: division into latitude zones of the part of the earth known to ancient geographers, used by Ptolemy.
clinometer: an instrument for measuring inclination.
common hours: system of hour reckoning, see article on time and date.
compass: instrument indicating directions by a magnetic needle, see article on compass.
compass card: card or paper with a printed, drawn or painted compass rose, usually carried above the magnetic needle of a compass.
compass dial: form of azimuth dial.
compass rose: diagram of the points of the compass, often decorated and coloured. North is usually indicated by a fleur-de-lys.
compasses: instrument for drawing circles. see article on drawing instruments.
compendium: several instruments compiled into one device; also see article on astronomical compendium.
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.
cross-staff: instrument for measuring angles between distant objects, mostly altitudes, see article on cross-staff.
cross-staffs: see article on cross-staff
crucifix dial: form of polyhedral sundial in the shape of a crucifix, see article on sundial.
cylinder dial: type of altitude dial, see article on the sundial.
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