Femonenaatmosphereknown ascircumhorizonarcorFireRainbow(rainbowfire),willappearwhenthe sun ishigh(morethan58degreesabove thehorizon).Sunlightshonethrough thestraightandcirrus clouds, resulting ina kind ofcrystalslabsandformedhexagonprismeffect.So it lookslike aflame-shapedrainbow.
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