Important information about tourism in Costa Rica - Florida

Heiligenschein, is an optical effect where a bright spot appears to surround the cast shadow of the head of the observer. The glowing spot is caused by rays of sunlight reflecting back from individual dewdrops, and the effect is best seen on a cool, clear morning.

The word translates from the German as "saintly illumination" or "holy light." The effect was described in the memoirs of Benvenuto Cellini (1500-1571), so it's sometimes called "Cellini's halo."
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Photo courtesy New York Times, which published the article "How to become an angel in the morning dew"
Heiligenschein on Wikipedia