Red rainbows happen when the sun is on the horizon. They’re created for much the same reason that a sunset or sunrise looks red. When the sun is low, its blue and green light is weakened by scattering during the long journey to your eyes through Earth’s atmosphere. The red light travels through more directly.
stygianaulos on July 12nd, 2020 at 21:30 UTC »
That looks ominous.
Kie723 on July 12nd, 2020 at 21:56 UTC »
Red rainbows happen when the sun is on the horizon. They’re created for much the same reason that a sunset or sunrise looks red. When the sun is low, its blue and green light is weakened by scattering during the long journey to your eyes through Earth’s atmosphere. The red light travels through more directly.
Source
Kangar on July 12nd, 2020 at 22:38 UTC »
Red rainbow at night, stripper's delight,
Red rainbow at morning, no strippers performing.