Alguns dels meridians de la terra
<p>Pearson Scott Foresman
</p>
<ul><li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Robertgarrigos" title="User:Robertgarrigos">Robertgarrigos</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Robertgarrigos" title="User talk:Robertgarrigos">talk</a>)</li></ul>
CC BY-SA 4.0
<a href="//commons.wikimedia.org/wiki/File:Longitude_(PSF).png" title="File:Longitude (PSF).png">File:Longitude_(PSF).png</a>