Daily Postcard: A double rainbow colors sky on April 7 over White Rock. The secondary rainbow is caused by a second reflection inside the droplet, and this “re-reflected” light exits the drop at a different angle – 50° instead of 42°. This is why the secondary rainbow appears above the primary rainbow. The secondary rainbow will have the order of the colors reversed, with red on the bottom and violet on the top. Source: NASA. Photo by Dave Lannen

Another view of a double rainbow coloring the sky on April 7 over White Rock. Photo by Dave Lannen

Another view of a double rainbow coloring the sky on April 7 over White Rock. Photo by Dave Lannen

Another view of a rainbow coloring the sky on April 7 over White Rock. Photo by Dave Lannen