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| | 142 to 146 of 227 glossary terms |
| pillar dial: type of altitude dial, see article on the sundial.
| pin gnomon: the part of a sundial which casts the shadow, where this part is in the form of a pin.
| plane table: type of surveying instrument, see article on the plane table.
| plane table alidade: an alidade specially adapted for use with a plane table.
| planetary hours: system of hour reckoning, see article on time and date.
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