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geometrical square: form of quadrant, with sides divided equally and having an alidade at one corner, used for measuring angles in terms of ratios in the manner of a shadow square on the back of an astrolabe.
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globe dial: form of sundial, where the hour lines are on the outer surface of a sphere.
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gnomon: the part of a sundial that casts the shadow for indicating the time.
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golden numbers: numbers denoting the positions of years in the lunar cycle, see article on time and date.
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graphometer: type of surveying instrument, see article on the graphometer.
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