https://www.iala.int/wiki/dictionary/index.php?action=history&feed=atom&title=Meteorological_Optical_Range 2026-05-03T12:00:30Z Revision history for this page on the wiki MediaWiki 1.41.5 https://www.iala.int/wiki/dictionary/index.php?title=Meteorological_Optical_Range&diff=9833&oldid=prev 2024-02-03T11:55:38Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 11:55, 3 February 2024</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l17">Line 17:</td> <td colspan="2" class="diff-lineno">Line 17:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Alphabetical Index]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Alphabetical Index]]</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:IALA Dictionary 1970-89 Edition]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:IALA Dictionary 1970-89 Edition]]</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:IALA Dictionary 2023 Revision]]</ins></div></td></tr> </table>

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<p></p> <p><b>New page</b></p><div><br /> &#039;&#039;&#039;2-1-290<br /> <br /> The length of path in the atmosphere required to reduce the luminous flux in a collimated beam from an incandescent lamp at a colour temperature of 2 700 K to 0.05 of its original value, the luminous flux being evaluated by means of the curve of spectral luminous efficiencies for photopic vision given by the International Commission on Illumination (C.I.E.) (2-1-015).<br /> <br /> Symbol: MOR<br /> <br /> Reference: W.M.O. (modified)<br /> <br /> <br /> Note: The quantity so defined above approximately corresponds to the distance in the atmosphere required to reduce the contrast of an object against its background to five per cent of the value it would have at zero distance, for daytime observation. The evidence of most experimental results at present indicates that, for practical purposes, it is also the same as the &quot;meteorological visibility&quot;, and that the earlier use of the &quot;meteorological range&quot; (2-1-280, Note 2:) was rather optimistic for practical applications.<br /> <br /> {{IALAFooter}}<br /> <br /> {{languages|Meteorological Optical Range}}<br /> [[Category:2.1 Optics and Vision]]<br /> [[Category:Alphabetical Index]]<br /> [[Category:IALA Dictionary 1970-89 Edition]]</div>

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