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unequal hours: system of hour reckoning, see article on time and date.
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universal dial: a sundial that can be used in any latitude.
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universal projection: a type of projection of the celestial sphere appropriate for use in any latitude.
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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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vertical dial: sundial where the hour lines are marked on a vertical surface, see article on the sundial.
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vertical disc dial: sundial where the hour lines are marked on a vertical surface in the form of a disc, see article on the sundial.
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volvelle: a device which rotates; usually referring to one or more discs which turn within a circular scale.
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