When the International Space Station’s orbit follows above the line between day and night on earth, the sun will never go completely below the horizon. ISS astronaut Reid Wiseman created a 6 second looping video he made from images over such a 92 minute orbit. The clip is on the Vine site, which hosts short looping videos :
Update: Reisman later posted this – Twitter / astro_reid:
Our orbit is almost parallel to the terminator so it is daylight with a low sun angle 24 hrs a day now on the #ISS. pic.twitter.com/Vd7bGm4Rnu