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52 to 56 of 227 glossary terms
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.
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.
dial: instrument for telling time by the position of the sun (occasionally by the moon), see article on the sundial.
dialling quadrant: instrument in the form of a quadrant used in the construction of a sundial.
diptych dial: type of sundial which, in many cases, could be called an astronomical compendium, in the form of a folding tablet, usually in ivory, with at least a string gnomon and a horizontal dial on the inside, but often with other dials as well.
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