Rainbow

An optical arc spanning 84 degrees of sky, always centered on your shadow/Weather & Climate

A rainbow is an optical phenomenon caused by the refraction, reflection, and dispersion of sunlight through water droplets. The primary rainbow forms an arc of about 42 degrees from the antisolar point (the point directly opposite the sun from the observer's perspective), giving the full bow an angular diameter of about 84 degrees. Each color refracts at a slightly different angle: red at 42 degrees, violet at 40 degrees, producing the familiar spectrum. A secondary rainbow, about 11 degrees outside the primary, has reversed colors and is caused by a second internal reflection. No two people see exactly the same rainbow because each observer's position defines a unique set of raindrops.