Along with the usual rainbow, which everyone saw, there is also one that can be seen at night (just a few people saw this one). Moreover, because of the dim reflection of the sun by the moon, to the naked eye, the lunar rainbow appears white.
However, the photographers who take pictures at slow shutter speeds can get the rainbow spectrum.
Unfortunately, there are not so much places on our planet where you can watch a lunar rainbow.
Nonetheless, scientists believe that if there is enough of the nebula and the weather is clear, night rainbow can be seen almost anywhere.
The lunar rainbow can be seen out of the waterfalls only if it’s raining in front of the moon.
In addition, a full moon is desirable, and it should not be above a 42-degree limit.