 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.


 Exact Time of Sunrise and Sunset

   February 03, 2021

    Capture

   Photographer:  Dario Giannobile
   Summary Author:  Dario Giannobile;  Marcella Giulia Pace

   The beautiful  sunset shown above was photographed without using
   special filters or lenses to enhance its majesty. It was taken near the
   Capo Granitola Light House in Sicily, on August 21, 2020.

   Near the horizon,  the Sun passes through a dense layer of
    atmosphere that attenuates its brightness and makes it appear
   red/orange. But this dense layer also generates an apparent slowdown in
   the advancement of the solar disk towards the horizon, causing the time
   of sunset to be different from that reported in the almanacs that don’t
   take into account  atmospheric refraction. The amount of time of the
   slowing down of a sunset, as well as the anticipation of sunrise, is
   different everywhere in the world. Of course, it also depends on the
   latitude where you live. At my latitude, the Sun delays its setting by
   about two minutes.

   Defining this gap in time between the actual and apparent sunrise and
   sunset is essential for navigation purposes. Sailors who use
    celestial navigation know the importance of this definition. It’s
   as important as a  GPS signal or the beam of light from a
   lighthouse.

   Photo Details: Camera: Canon EOS 6D; Software: Adobe Photoshop 21.1
   (Windows); Exposure Time: 0.0040s (1/250); Aperture: ƒ/8.0; ISO
   equivalent: 400; Focal Length: 283.0mm
     * Capo Granitola Light House, Italy Coordinates:  37.56595,
       12.66208

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    More...

Sun Links

     *  NASA Solar Dynamics Observatory
     *  NASA Solar Eclipse Page
     *  NOAA Solar Calculator
     *  The Sun-Earth Connection: Heliophysics
     *  The Sunspot Cycle
     *  Solar System Exploration: The Sun
     *  The Sun Now
     *  This Week’s Sky

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   Earth Science Picture of the Day is a service of the  Universities
   Space Research Association.

https://epod.usra.edu
 
