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Wikipedia definition
1. Supralateral arcA supralateral arc is a rare halo, an optical phenomenon often confused with the indeed infrequently appearing 46° halo. Distinguishing between the two is furthermore difficult as supralateral arcs typically only appears in fragments while the 46° halo is very faint. In contrast to the static 46° halo, the shape of a supralateral arc varies with the elevation of the sun. Before the sun reaches 15°, the bases of the arc touches the lateral (oriented sidewise) sides of the 46° halo.
Read “Supralateral arc” on English Wikipedia
Read “ラテラルアーク” on Japanese Wikipedia
Read “Supralateral arc” on DBpedia

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