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| | 92 to 96 of 227 glossary terms |
| hodometer: device for measuring distance by means of a wheel, pushed along the ground, attached to a geared movement with a dial or other form of distance register.
| horary quadrant: quadrant used to tell the time, usually from a measure of solar altitude, see article on the quadrant.
| horizon obliquus: line denoting the local horizon on an astrolabe latitude plate, see article on the astrolabe.
| horizon rectus: east-west line on an astrolabe latitude plate, see article on the astrolabe.
| horizontal dial: sundial where the hour lines are marked on a horizontal surface, see article on the sundial.
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