Geographical Range: Difference between revisions

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Superseded by new definition from Guideline G1065
'''urn:mrn:iala:dic:2-1-0245'''


 
The greatest distance at which an object or a light source can be seen under conditions of perfect visibility, as limited only by the curvature of the earth, by refraction of the atmosphere, and by the elevation of the observer and the object or light.
'''2-1-245
 
The maximum distance at which light from a light or other aid to navigation can reach an observer, as limited only by the curvature of the earth and refraction in the atmosphere and by the heights of the observer and of the light or aid.


[[Image:Ch2_Fig9.jpg|400px|border]]
[[Image:Ch2_Fig9.jpg|400px|border]]


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{{languages|Geographical Range}}
{{languages|Geographical Range}}
[[Category:Historical Terms]]
[[Category:2.1 Optics and Vision]]
[[Category:Alphabetical Index]]
[[Category:Alphabetical Index]]
[[Category:IALA Dictionary 1970-89 Edition]]
[[Category:IALA Dictionary 2018 Revision]]
[[Category:Approved by Council through approval of source document]]
[[Category:IALA Dictionary 2023 Revision]]

Latest revision as of 08:55, 17 September 2026

urn:mrn:iala:dic:2-1-0245

The greatest distance at which an object or a light source can be seen under conditions of perfect visibility, as limited only by the curvature of the earth, by refraction of the atmosphere, and by the elevation of the observer and the object or light.