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lower tangent arc at Jämsä
The bright light, cut in half by the upper edge of the picture, is the Moon. The rainbow coloured "cuppola" that appears to rest on the ground is called a lower tangent arc. Finnish amateur astronomer Arto OKSANEN photographed this spectacular lunar halo on November 22, 2004. The location was Jämsä, some 2 km (1.2 miles) north of the Himos Ski Centre, were snow guns were producing the ice mist that created this unique display.

For a picture of another extraordinary halo phenomenon captured on camera that same night, see OP-PM-02.

[© Arto OKSANEN - photo used with permission (more pictures by Arto OKSANEN can be viewed on]