 EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


 Solar Halo and Lunar Halo Observed from Zsámbék, Hungary

   March 29, 2021

    Halos_of_january_abraham

   Photographer:  Tamas Abraham
   Summary Author:  Tamas Abraham;  Jim Foster

   Featured above are two photos of  22-degree halos that I observed
   from Zsámbék, Hungary, a few weeks back. The top photo shows a solar
   halo taken on January 18, 2021. At center are the ruins of the 900-year
   old  Premontre monastery church that was used here to mask  the
   Sun, permitting the halo itself to be more easily seen. The lower photo
   shows a lunar halo taken on January 25. Note that the stars of
    Orion are twinkling through the halo at the 4:00 position.

   Whether observed at night or day, 22-degree halos (22-degrees is the
   halo’s radius) form when randomly oriented, pencil-shaped  ice
   crystals refract sunlight or moonlight. On occasion, these crystals are
   free-falling in the atmosphere but most often they compose  cirrus
   clouds. In order for the complete halo to be seen, the Sun or  Moon
   must be at least 22-degrees above the horizon.

   Photo Details: Canon EOS 400D camera; Canon EF-S 10-22 USM lens.
     * Zsámbék, Hungary Coordinates:  47.5474, 18.7214

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Atmospheric Effects Links

     *  Atmospheric Optics
     *  Color and Light in Nature
     *  The Colors of Twillight and Sunset
     *  Refraction Index
     *  Image Gallery: Atmospheric Effects
     *  What is a Rainbow?

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   Space Research Association.

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