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| 44 to 48 of 227 glossary terms |
| 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.
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