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margin: .1em .5em;"><b>[<span class="plainlinks plainlinksneverexpand"><a rel="nofollow" class="external text" href="https://citizendium.org/wiki/index.php?title=Light_month&action=edit&section=0"><font size="2">edit intro</font></a></span>]</b></div> </td></tr></tbody></table></div> <p>The <b>light month</b> is the distance that the <a href="/wiki/Light" title="Light">light</a> travels in <a href="/wiki/Vacuum" class="mw-redirect" title="Vacuum">vacuum</a> in one <a href="/wiki/Month" title="Month">month</a> and so is a unit of distance. According to the <a href="/wiki/index.php?title=IAU&action=edit&redlink=1" class="new" title="IAU (page does not exist)">IAU</a> one month is defined as 30 <a href="/wiki/index.php?title=Days&action=edit&redlink=1" class="new" title="Days (page does not exist)">days</a> with 86400 <a href="/wiki/Second" class="mw-redirect" title="Second">seconds</a> each day. </p><p>Similar units are the <a href="/wiki/Light_second" title="Light second">light second</a>, <a href="/wiki/Light_minute" title="Light minute">light minute</a>, <a href="/wiki/Light_hour" title="Light hour">light hour</a>, <a href="/wiki/Light_day" title="Light day">light day</a>, <a href="/wiki/Light_week" title="Light week">light week</a>, <a href="/wiki/Light_year" title="Light year">light year</a>. </p> <div id="toc" class="toc" role="navigation" aria-labelledby="mw-toc-heading"><input type="checkbox" role="button" id="toctogglecheckbox" class="toctogglecheckbox" style="display:none" /><div class="toctitle" lang="en" dir="ltr"><h2 id="mw-toc-heading">Contents</h2><span class="toctogglespan"><label class="toctogglelabel" for="toctogglecheckbox"></label></span></div> <ul> <li class="toclevel-1 tocsection-1"><a href="#numerical_value"><span class="tocnumber">1</span> <span class="toctext">numerical value</span></a></li> <li class="toclevel-1 tocsection-2"><a href="#Comparison_to_other_Units"><span class="tocnumber">2</span> <span class="toctext">Comparison to other Units</span></a></li> <li class="toclevel-1 tocsection-3"><a href="#Distances_in_light_months"><span class="tocnumber">3</span> <span class="toctext">Distances in light months</span></a></li> <li class="toclevel-1 tocsection-4"><a href="#Notes"><span class="tocnumber">4</span> <span class="toctext">Notes</span></a></li> </ul> </div> <h3><span class="mw-headline" id="numerical_value">numerical value</span></h3> <ul><li><a href="/wiki/Velocity" title="Velocity">velocity</a> of <a href="/wiki/Light" title="Light">light</a> in <a href="/wiki/Vacuum" class="mw-redirect" title="Vacuum">vacuum</a>: 299,792,458 m/s <sup id="cite_ref-1" class="reference"><a href="#cite_note-1">[1]</a></sup> (<a href="/wiki/Meter" class="mw-redirect" title="Meter">meters</a>/<a href="/wiki/Second" class="mw-redirect" title="Second">second</a>)</li> <li>1 <a href="/wiki/Month" title="Month">month</a> = 30 <a href="/wiki/index.php?title=Days&action=edit&redlink=1" class="new" title="Days (page does not exist)">days</a> = 720 <a href="/wiki/index.php?title=Hours&action=edit&redlink=1" class="new" title="Hours (page does not exist)">hours</a> = 43,200 <a href="/wiki/index.php?title=Minutes&action=edit&redlink=1" class="new" title="Minutes (page does not exist)">minutes</a> = 2,592,000 <a href="/wiki/index.php?title=Seconds&action=edit&redlink=1" class="new" title="Seconds (page does not exist)">seconds</a></li> <li>1 light month = 777,062,051,136,000 m = 7.7706205 * 10<sup>14</sup>m</li></ul> <p><br /> </p> <h3><span class="mw-headline" id="Comparison_to_other_Units">Comparison to other Units</span></h3> <ul><li>1 light month = 777,062,051,136.000 <a href="/wiki/Km" class="mw-redirect" title="Km">km</a> = 7.7706205 * 10<sup>11</sup> <a href="/wiki/Km" class="mw-redirect" title="Km">km</a></li> <li>1 light month = 482,843,973,156.764 <a href="/wiki/index.php?title=Mi&action=edit&redlink=1" class="new" title="Mi (page does not exist)">mi</a> <sup id="cite_ref-2" class="reference"><a href="#cite_note-2">[2]</a></sup> = 4.8284397 * 10<sup>11</sup> <a href="/wiki/index.php?title=Mi&action=edit&redlink=1" class="new" title="Mi (page does not exist)">mi</a></li> <li>1 light month = 2,549,416,178,267,716.535 <a href="/wiki/index.php?title=Ft&action=edit&redlink=1" class="new" title="Ft (page does not exist)">ft</a><sup id="cite_ref-3" class="reference"><a href="#cite_note-3">[3]</a></sup> = 2.5494162 * 10<sup>15</sup> <a href="/wiki/index.php?title=Ft&action=edit&redlink=1" class="new" title="Ft (page does not exist)">ft</a></li> <li>1 light month = 849,805,392,755,905.511 <a href="/wiki/index.php?title=Yd&action=edit&redlink=1" class="new" title="Yd (page does not exist)">yd</a> <sup id="cite_ref-4" class="reference"><a href="#cite_note-4">[4]</a></sup> = 8.4980539 * 10<sup>14</sup> <a href="/wiki/index.php?title=Yd&action=edit&redlink=1" class="new" title="Yd (page does not exist)">yd</a></li></ul> <p><br /> </p> <h3><span class="mw-headline" id="Distances_in_light_months">Distances in light months</span></h3> <p>Unfortunately there are no distances in nature where it make sense to express them in light months. Distances in our solar system are normally expressed in <a href="/wiki/Light_second" title="Light second">light seconds</a> up to <a href="/wiki/Light_day" title="Light day">light days</a>. Distances in our galaxy are normally expressed in <a href="/wiki/Light_year" title="Light year">light years</a>. </p> <h3><span class="mw-headline" id="Notes">Notes</span></h3> <div class="references-2column"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text">Review of Particle Physics <a rel="nofollow" class="external text" href="http://stacks.iop.org/JPhysG/33/1">Particle Data Group: W.-M. Yao <i>et al.</i>, J. Phys. G 33, 1 (2006).</a></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text">1 mi = 1609.344 m</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"> 1 ft = 0.3048 m</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text"> 1 yd = 0.9144 m</span> </li> </ol></div> </div>  </div> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://citizendium.org/wiki/index.php?title=Light_month&oldid=978863">https://citizendium.org/wiki/index.php?title=Light_month&oldid=978863</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Special:Categories" title="Special:Categories">Categories</a>: <ul><li><a href="/wiki/Category:CZ_Live" title="Category:CZ Live">CZ Live</a></li><li><a href="/wiki/Category:Astronomy_Workgroup" title="Category:Astronomy Workgroup">Astronomy Workgroup</a></li><li><a href="/wiki/Category:Articles_written_in_British_English" title="Category:Articles written in British English">Articles written in British English</a></li><li><a href="/wiki/Category:Advanced_Articles_written_in_British_English" title="Category:Advanced Articles written in British English">Advanced Articles written in British English</a></li><li><a href="/wiki/Category:All_Content" title="Category:All Content">All Content</a></li><li><a href="/wiki/Category:Astronomy_Content" title="Category:Astronomy Content">Astronomy Content</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Astronomy_tag" title="Category:Astronomy tag">Astronomy tag</a></li><li><a href="/wiki/Category:Suggestion_Bot_Tag" title="Category:Suggestion Bot Tag">Suggestion Bot Tag</a></li></ul></div></div> </div> </div> <div id="mw-navigation"> <h2>Navigation menu</h2> <div id="mw-head"> <nav id="p-personal" class="vector-menu mw-portlet mw-portlet-personal vector-user-menu-legacy" aria-labelledby="p-personal-label" role="navigation" > <h3 id="p-personal-label" class="vector-menu-heading " > <span class="vector-menu-heading-label">Personal tools</span> </h3> <div class="vector-menu-content"> <ul class="vector-menu-content-list"><li id="pt-login" class="mw-list-item"><a href="/wiki/index.php?title=Special:UserLogin&returnto=Light+month" title="To edit pages, [[Special:RequestAccount|get a contributor account]]. 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