Translation in french of a picture representing noctilucent clouds: <a class="external free" href="https://commons.wikimedia.org/wiki/File:Noctilucent_clouds_scheme.gif">https://commons.wikimedia.org/wiki/File:Noctilucent_clouds_scheme.gif</a>
Translation in french by Didier Walliang and drawing by Pierre Haydont
Translation in french and redrawing of this picture : <a class="external free" href="https://fr.wikipedia.org/wiki/Nuage_noctulescent#/media/Fichier:Noctilucent_clouds_scheme.gif">https://fr.wikipedia.org/wiki/Nuage_noctulescent#/media/Fichier:Noctilucent_clouds_scheme.gif</a>