Skydivers in Nottinghamshire, UK, recently experienced a breathtaking sight: a full-circle rainbow. While rainbows typically appear as arcs from the ground, their true form is that of a complete circle. This phenomenon is due to the way light refracts and reflects within raindrops. From ground level, the horizon usually obstructs the lower portion of the circle, making it appear as an arc. However, skydivers soaring thousands of feet above the earth have an unobstructed view, allowing them to witness the entire circular rainbow in its full glory.