 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.


 Archive - Afternoon Analemma for Athens

   January 23, 2021

    Analemma1600

   Every weekend we present a notable item from our archives. This EPOD
   was originally published January 23, 2004.

   Provided by:  Anthony Ayiomamitis
   Summary authors & editors:  Anthony Ayiomamitis;  Jim Foster

   The image above is a set of 44 multi-exposures on the same frame of
   film taken from January through December of 2003, in Athens, Greece at
   precisely 16:00:00 Local Meridian Time (the foreground was added
   later). This analemma represents the motion of the Sun during the
   course of one year as observed in the late afternoon. As a result of
   the Earth's tilt about its axis (23.5 degrees) and its elliptical orbit
   about the Sun, the position of the Sun in the sky changes from one day
   to the next, even when observed at the same time on each day of the
   year. Furthermore, the figure 8 loop the Sun makes in the sky over a
   12-month period (analemma) will be inclined at different angles
   depending on one's geographical latitude. The latitude of Athens is
   approximately 38 degrees. Imaging the Sun over a given location for an
   entire year is a demanding photographic accomplishment indeed -- few
   such attempts have been successful.


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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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   Space Research Association.

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