Description from PetaPixel:

“Moonbows” are rainbows that appear at night under moonlight, and are difficult to see with human eyes but beautiful when captured in long exposure photographs. There aren’t many places on Earth where this phenomenon can be regularly witnessed, but a few of them are found at the waterfalls in Yosemite.

Steven Bumgardner, the video producer for the national park, spent two years moonbow hunting and shot over 20,000 still photos with a Canon 5D Mark II to create the time-lapse sequences seen in the video above. After watching, you might want to add “moonbows” your list of things to see and photograph (along with the northern lights, perhaps).

[youtube=http://www.youtube.com/watch?v=_68ytOYnTvs]Yosemite Nature Notes – Episode 15 – Moonbows

Uploaded by on Jul 1, 2011

From the Milky Way to the moon, the beauty of Yosemite is on display 24 hours a day. During the full moon of the the spring and early summer, lunar rainbows, also known as moonbows, can be seen on many park waterfalls