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| 33 to 37 of 227 glossary terms |
| celestial spheres: system of concentric, rotating orbs centred on the earth, proposed by Aristotle and others as constituting the physical construction of the heavenly system of planets and stars.
| chalice dial: sundial where the hour lines are inscribed on the inside surface of a goblet. A second set of lines can be included to allow for refraction, when the goblet is full. See also scaphe dial.
| circumferentor: form of surveying compass with fixed sights, where bearings are read from the position of a magnetic compass, see also article on the theodolite.
| climates: division into latitude zones of the part of the earth known to ancient geographers, used by Ptolemy.
| clinometer: an instrument for measuring inclination.
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