Lunar rainbows Maghera, N. Ireland. Imaged by Martin Mc Kenna (more images) on July 19, '08. Lunar bows are rare and faint. The secondary lunar bow (right) is even more unusual. Moonbows need a bright moon low in a dark sky and of course rain falling opposite the moon. Martin says "I have seen perhaps six or so moonbows in my life and each one of them was worth seeing and unforgettable to say the least. I recall spending an entire night out during the Winter this year in a field getting soaked by rain and hail trying to catch this very rare phenomena."   Images ©M. Mc Kenna, shown with permission.