A circumzenithal arc (which is related to but distinct from a rainbow halo around the sun or moon, as Wikipedia itself says, “An upside-down rainbow”) is that frown turned upside down.
September 04, 2013
June 06, 2017
December 05, 2017
A circumzenithal arc (which is related to but distinct from a rainbow halo around the sun or moon, as Wikipedia itself says, “An upside-down rainbow”) is that frown turned upside down.