Kepler's First Law representing the Moon and Earth.
<a href="//commons.wikimedia.org/wiki/User:Willian_Vieira_de_Abreu" title="User:Willian Vieira de Abreu">Willian Vieira de Abreu</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>