sundog
  幻日
  Sun·dog n. Meteorol.
  1. A luminous spot occasionally seen a few degrees from the sun, supposed to be formed by the intersection of two or more halos, or in a manner similar to that of halos.
  2. A fragmentary rainbow; a small rainbow near the horizon; -- called also dog and weathergaw.
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  sundog
       n : a bright spot on the parhelic circle; caused by diffraction
           by ice crystals; "two or more parhelia are usually seen
           at once" [syn: parhelion, mock sun]