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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.
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horary quadrant: quadrant used to tell the time, usually from a measure of solar altitude, see article on the quadrant.
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horizon obliquus: line denoting the local horizon on an astrolabe latitude plate, see article on the astrolabe.
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horizon rectus: east-west line on an astrolabe latitude plate, see article on the astrolabe.
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horizontal dial: sundial where the hour lines are marked on a horizontal surface, see article on the sundial.
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hour lines: the time divisions on a sundial or other astronomical instrument.
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hour ring: the part of a sundial marked with the time divisions, where this part is in the form of a ring or broken ring.
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inclining dial: type of sundial projected as a horizontal dial for a particular latitude, but which can be inclined for use in a range of other latitudes.
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