[hahy-li-guh
n-shahyn] 
[-shahy-nuh] . German. | a ring of light around the shadow cast by a person's head, esp. on a dewy, sunlit lawn, caused by reflection and diffraction of light rays; halo. |
heiligenschein
bright white ring surrounding the shadow of the observer's head on a dew-covered lawn with a low solar elevation angle. The low solar angle causes an elongated shadow, so that the shadow of the head is far from the observer, a condition that is apparently required for Cellini's halo to be observed.
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