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| 46 to 50 of 227 glossary terms |
| 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.
| declination: angle above or below the celestial equator.
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