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ring dial: simple form of altitude dial in the shape of a ring, for use in one latitude.
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rule (or ruler): an instrument of multifarious functions in the form of a straight rod of metal, wood or other material; a folding rule is an alternative form with two or more jointed legs.
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Saints' days: anniversary days for Christian saints.
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scaphe dial: sundial where the hour lines are marked on a concave hemisphere or part hemisphere.
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sector: calculating instrument using pairs of lines on the faces of two hinged arms, see article on the sector.
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