On the Trails of Stars | Letters to Earth

Astronaut Don Pettit took some long exposures and captured star trails from a different perspective. I find the wiggly solar panels (top of the photo) interesting.

As Space Station orbits, it keeps one side always facing the Earth (the nadir direction from the crew’s point of view). This requires the Station to complete one revolution about its axis each orbit, just like the Moon. ISS rotates about its center of mass, which happens to be in the Unity, or Node 1 module. So it rotates almost aligned with the Station’s long, backbone-like truss.

Space Station makes one revolution every 90 minutes (the Moon takes 28 days). As a result, long-exposure pictures taken from the Station show star trails as circular arcs, with the center of rotation being the poles of Space Station (perpendicular to our orbital plane.)

via On the Trails of Stars | Letters to Earth.