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| 211 to 215 of 227 glossary terms |
| tympanum: Latin name (plural tympana) for a latitude plate of an astrolabe.
| unequal hours: system of hour reckoning, see article on time and date.
| universal dial: a sundial that can be used in any latitude.
| universal projection: a type of projection of the celestial sphere appropriate for use in any latitude.
| vane: upright piece, in this context usually forming a sight and often pierced with a pinhole, a slit, or a slot with a vertical wire.
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