With a steady mount, long exposures and a few other tricks, you can take images of star trails, too. Star trails are really arcs, or partial circles, whose ever-circling motions forever tabulate the passage of time. What you need to capture star trailsEarthSky Facebook friend Ken Christison has some wonderful photos of star trails. Visit Ken Christison’s Facebook pageRead more: Long exposure star trail photographyStar trails from our communityA star trails videoMoon and sun trails from our communityBottom line: Star trails are photographs of the sky taken with long exposures. But you can also take photos of sun trails, moon trails, or trails of the planets.