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| 日本群馬縣高山村就被天文台記錄到出現夜間彩虹的奇景 |
A moonbow
(also known as a lunar rainbow, black rainbow, white rainbow, lunar
bow, or space rainbow) is a rainbow produced by light reflected off the
surface of the moon (rather than from direct sunlight) refracting off of
moisture in the air. Moonbows are relatively faint, due to the smaller
amount of light reflected from the surface of the moon. They are always
in the opposite part of the sky from the moon.Because the light is
usually too faint to excite the cone color receptors in human eyes, it
is difficult for the human eye to discern colors in a moonbow. As a
result, they often appear to be white. However, the colors in a moonbow
do appear in long exposure photographs. [from http://en.wikipedia.org/wiki/Moonbow]
