<a href="//commons.wikimedia.org/wiki/Category:Foucault_pendulum" title="Category:Foucault pendulum">Foucault pendulum</a> at the Querétaro Museum of Science and Technology, in <a href="//commons.wikimedia.org/wiki/Category:Santiago_de_Quer%C3%A9taro" title="Category:Santiago de Querétaro">Santiago de Querétaro</a>, Querétaro state, México.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/68518558@N00">Éamonn Ó Muirí</a>
CC BY 2.0
originally posted to <b><a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a></b> as <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/68518558@N00/2394537765">Focault Pendulum</a>