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| Rare in Europe - Circumhorizon Arc Denis Joye captured this halo near Paris on 31st May '11 before his viewing was curtailed by a fast moving lower cloud. ©Denis Joye, shown with permission. |
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The circumhorizon arc (CHA) needs the sun higher than 58° which in mid to northern Europe means that it can only be seen for a few days or weeks around the summer solstice.
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