Cool facts about rainbows you'll love
A rainbow is always considered as a lucky and colorful scenery. Watching a rainbow after a rainfall is the most pleasant experience anyone would love to get. Rainbows are truly one of the most beautiful gifts of the nature.
Rainbow effect is formed by reflection, refraction and dispersion of light in water droplets.
It is impossible to observe a rainbow at any angle other than 42 degrees from the direction opposite the light source.
Rainbows can be formed by not only rain but mist, spray and airborne dew.
In a primary rainbow, the outer part of the rainbow is red and the inner part is violet.
A secondary rainbow appears outside of a primary rainbow. The color scheme of the secondary rainbow is opposite of the primary rainbow.
Every rainbow is a circle. But we can only see the upper half of the rainbow as we watch it from the ground. If we watch it from above the earth such as in an aeroplane we can see the rainbow in full circle.
It is difficult to photograph the complete semicircle of a rainbow in one frame.
Rainbows are often seen near waterfalls and fountains.
Rainbows cannot be physically approached or touched.
Rainbows become rare in winter.
Two people see the same rainbow different, because only the light from some raindrops reaches the observer's eye. Therefore two people in slightly different places see different rainbows.
When both primary and secondary rainbows are visible it is called a double rainbow. Usually all rainbows are double rainbows. But often secondary rainbow is invisible as it is fainter than the primary rainbow.
The dark area between the primary and secondary bows is called Alexander’s band.
Twinned rainbow is appeared as two rainbows split from a single base. This is also one of the rarest types of rainbows to observe.
Reflected rainbow, Reflection rainbow
A reflected rainbow may appear in the water surface below the horizon.
A reflection rainbow may be produced where sunlight reflects off a body of water before reaching the raindrops.
Monochrome rainbow / Red rainbow
Monochrome rainbows appear after rainfall during sunrise or sunset. This rainbow requires the sun to be close to the horizon.
Moonbow / Lunar rainbow
Rainbows can be caused by the moonlight. Rainbows formed by the light from the moon are also called lunar rainbows or nighttime rainbows. They are much dimmer than the solar rainbows. Near full moon is required to form a moonbow.
Fogbow / White rainbow
Fogbows are formed by much smaller cloud and fog droplets rather than rain. The fogbow has only very weak colors. When a fogbow appears at night it is called a lunar fogbow.
Rainbows on Titan
Saturn’s moon is known for the formation of rainbows as it has a wet surface and humid clouds. The radius of a Titan rainbow would be about 49° instead of 42°.