http://www.okinawatimes.co.jp/article_photo/44998/

Night rainbow, Lunar rainbow, Moonbow, space rainbow. There are many names you can call it. Gekkou （月虹）is a rainbow produced by moonlight, usually faint and appears white to the human eye. This incredible natural phenomenon which is believed to bring happiness was observed by the Ishigakijima Astronomical Observatory on January 7th, 2012. What a beautiful start for the New Year!