A diagram showing a great circle passing through points A and B (red)
<a href="//commons.wikimedia.org/wiki/User:HaEr48" title="User:HaEr48">HaEr48</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>, This file was derived from: <a href="//commons.wikimedia.org/wiki/File:Polar_angle_to_spherical_side.svg" title="File:Polar angle to spherical side.svg">Polar angle to spherical side.svg</a>: <a href="//commons.wikimedia.org/wiki/File:Polar_angle_to_spherical_side.svg" class="image"><img alt="Polar angle to spherical side.svg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/1/19/Polar_angle_to_spherical_side.svg/150px-Polar_angle_to_spherical_side.svg.png" decoding="async" width="150" height="151" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/1/19/Polar_angle_to_spherical_side.svg/225px-Polar_angle_to_spherical_side.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/1/19/Polar_angle_to_spherical_side.svg/300px-Polar_angle_to_spherical_side.svg.png 2x" data-file-width="1839" data-file-height="1846"></a> <i>by</i> <a href="//commons.wikimedia.org/w/index.php?title=User:Episcophagus&amp;action=edit&amp;redlink=1" class="new" title="User:Episcophagus (page does not exist)">Episcophagus</a><br>