A circumhorizontal arc (also popularly called fire rainbow) is a rare optical phenomenon. In order to be observed, the sun must be very high in the sky, at an elevation of 57.8° (90 -32.2°) or more, and can only occur in the presence of cirrus clouds. As a result it cannot be observed at locations north of 55°N or south of 55°S, although occasionally at higher latitudes from mountains.
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