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cylinder dial: type of altitude dial, see article on the sundial.
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declination: angle above or below the celestial equator.
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declinatory: instrument used in constructing a sundial, to find the declination of a plane.
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degrees: the conventional divisions of a circle, one being the 360th part of a circle, and thus the units used to measure and express angles.
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diagonals: lines used in the subdivision of divisions of an arc, also known as transversals. Each diagonal line is drawn across the division from its beginning to its end, and is divided linearly either by dots or by concentric arcs. In this way the linear division of a line can be used for the angular subdivision of an arc.
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