A screengrab from a video shared by the Hawaii Department of Land and Natural Resources shows a full-circle rainbow that formed over Waimea Canyon in Kaua'i in February 2023.
According to EarthSky, a circular rainbow is a very rare sight, requiring sky conditions to be "just right.""And even if they are, the bottom part of a full-circle rainbow is usually blocked by your horizon," the science and nature website adds. "That’s why we see rainbows not as circles, but as arcs across our sky." Palm tree surrounded by a circular rainbow, Bahia State, Northeastern Brazil. (Photo by Ricardo Funari/Brazil Photos/LightRocket via Getty Images) RELATED: Rare, red rainbow spotted in FinlandMountain climbers and pilots sometimes see near or full-circle rainbows, as the viewer must be above the observable horizon so that the bottom of the circle doesn’t get blocked from view.A woman in Maryville, Missouri, was treated to a stunning post-storm double sunset rainbow late on June 24.This story was reported from Los Angeles..