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 Halo over Chek Lap kok The picture shows a special optical phenomenon called halo, seen over Chek Lap Kok on 17 April 2003. Halos result from the refraction or reflection of light by ice crystals suspended in the atmosphere.
Halo in the form of ring over Chek Lap Kok on 17 April 2003 (Photo: Courtesy of Mr. C.S. Yuen)
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