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The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.

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17-31-022

geographical range

geographic range

greatest distance at which an object or a light source could be seen under conditions of perfect visibility, as limited only by the curvature of the Earth, by refraction in the atmosphere, and by the heights of the observer and the object or light source

Note 1 to entry: This entry was numbered 845-11-24 in IEC 60050-845:1987.

Note 2 to entry: This entry was numbered 17-488 in CIE S 017:2011.

Publication date: 2020-12
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