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| | 55 to 59 of 227 glossary terms |
| 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.
| disc dial: type of sundial belonging in the class of altitude dial.
| dividers: instrument with jointed legs for measuring and transferring distances, see article on the dividers.
| dominical letter: letter denoting the day of the first Sunday of the year, see article on time and date.
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