Whenever you see a low-slung rainbow such as this, you can be sure that it was taken well after sunrise or well before sunset.  Photographer: Leah Fiander

My wife captured this bright primary rainbow from a small boat while traveling from the Great Barrier Reef back to Cairns, Australia. Rainbows have a radius of approximately 42.5 degrees and are centered on the antisolar point — opposite of the rainbow. This picture was taken when the sun was approximately 30 to 35 degrees above the horizon, which means that the antisolar point was approximately 33 degrees below the opposite horizon. Therefore, the bow itself was about 10 degrees above the horizon.

via epod