3. MOONBOW is like a rainbow. But, the different is
produced by moonlight, not a sunlight. So, the
reflected light of moonbow is weak. It caused that
sometime a moonbow just looked like a white light
or a relatively faint light. Beside it, Moonbow is an
amazing phenomena! It happend when you are still
sleep, in the night.
Moonbows are most easily viewed when the moon
is near to full. For true moonbows, other than
those produced by waterfalls or sprays, the moon
must be low in the sky (less than 42 degrees and
preferably lower) and the sky must be very dark.
Since the sky is still light on a rising full moon,
this means they can only be observed 2 to 3 hours
before sunrise, a time with few observers. And, of
course, there must be rain falling opposite the
moon.
4. This combination of requirements makes
moonbows much rarer than rainbows produced
by the sun. Moonbows may also be visible when
rain falls during full moonrise at extreme latitudes
during the winter months, when the prevalence of
the hours of darkness give more opportunity for
the phenomenon to be observed.
Few places in the world frequently feature spray
moonbows. Such sites in the United States
include several waterfalls in Yosemite National
Park, California and Cumberland Falls, near
Corbin, Kentucky, Victoria Falls, in Africa on the
border between Zambia and Zimbabwe, is also
widely known for spray moonbows.