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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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cylinder dial: type of altitude dial, see article on the sundial.
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