<p>
	<span id="result_box" lang="fr"><span>L&#39;</span><span>octant</span> <span>a &eacute;t&eacute; invent&eacute; </span><span>en 1731 par</span> <span>Edmond</span> <span>Halley</span><span>.</span> <span>C&#39;</span><span>est un instrument &agrave; r&eacute;flexion,&nbsp;</span><span>utilis&eacute;</span> <span>dans la navigation</span> <span>pour mesurer</span> <span>les hauteurs</span> <span>et les distances des</span> <span>&eacute;toiles </span><span>.</span>&nbsp; <span>Fait de&nbsp;</span><span>bois,</span>&nbsp; <span>d&#39;ivoire</span> <span>et de laiton</span>,<span> les premiers</span> <span>miroirs</span> <span>&eacute;taient en</span> <span>m&eacute;tal poli</span> <span>jusqu&#39;&agrave; ce que</span> <span>les progr&egrave;s techinique&nbsp;</span> <span>a permis l&#39;utilisation</span> <span>de <a href="http://www.antiquites-en-france.com/antiquites/-/-/-/miroir-a-mercure">miroirs au</a></span><a href="http://www.antiquites-en-france.com/antiquites/-/-/-/miroir-a-mercure">&nbsp;<span>mercure</span></a> <span>suivi</span> <span>par des miroirs</span> <span>en argent</span>&nbsp;<span> dans le</span> <span>19&egrave;me</span> si&egrave;cle<span>.</span></span></p>