Simulated motion of the <a href="https://en.wikipedia.org/wiki/International_Space_Station" class="extiw" title="w:International Space Station">International Space Station</a> over North America, with 12 second motion markers and vertical lines projecting down to the surface of the Earth. The ISS is shown red when it enters the earth's shadow and can't be seen. It is only easily visible in the twilight interval of night just after sunset, or before sunrise.
<a href="//commons.wikimedia.org/wiki/User:Tomruen" title="User:Tomruen">Tomruen</a>
<span class="int-own-work" lang="en">Own work</span>