Comet C/2006 P1 McNaught, 20 January 2007, 0135 UT. About one hour after sunset. Canon 300D, 120 second exposure, 18mm FL, f/3.5, ISO 400. The head is well below the horizon (below the Sun, in fact), but the these tail components extend to an altitude of 30°. The surrounding glow is zodiacal light. Mouse over the image for a constellation overlay. Special processing was used to remove the effects of star trailing during the 2-minute exposure. You can see the original, unprocessed image here.