Astronomy Picture of the Day

   [1]Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                              2023 December 22
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                             183 Days in the Sun
               Image Credit & [3]Copyright: José Zarcos Palma

   Explanation: A single 183 day exposure with a pinhole camera and
   photographic paper resulted in this long-duration [4]solargraph.
   Recorded from [5]solstice to solstice, June 21 to December 21, in 2022,
   it follows the Sun's daily arcing path through planet Earth's skies
   from Mertola, Portugal. On June 21, the Sun's highest point and longest
   arc represents the longest day and the astronomical beginning of summer
   in the northern hemisphere. The solstice date with the fewest hours of
   daylight is at the beginning of winter in the north, corresponding to
   the Sun's shortest and lowest arc in the 2022 solargraph. For 2023, the
   northern winter solstice was on December 22 at 3:27 UTC. [6]That's
   December 21 for North America time zones.

                      Tomorrow's picture: light-weekend
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    Authors & editors: [18]Robert Nemiroff ([19]MTU) & [20]Jerry Bonnell
                                 ([21]UMCP)
          NASA Official: Phillip Newman [22]Specific rights apply.
              [23]NASA Web Privacy Policy and Important Notices
                A service of: [24]ASD at [25]NASA / [26]GSFC,
                         [27]NASA Science Activation
                           & [28]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2312/solsticesolargraphy.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.nightwise.org/solargraphs
   5. https://svs.gsfc.nasa.gov/14366/
   6. https://earthsky.org/astronomy-essentials/everything-you-need-to-know-december-solstice/
   7. https://apod.nasa.gov/apod/ap231221.html
   8. https://apod.nasa.gov/apod/archivepix.html
   9. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  10. https://apod.nasa.gov/apod/lib/aptree.html
  11. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  12. https://apod.nasa.gov/apod/calendar/allyears.html
  13. https://apod.nasa.gov/apod.rss
  14. https://apod.nasa.gov/apod/lib/edlinks.html
  15. https://apod.nasa.gov/apod/lib/about_apod.html
  16. http://asterisk.apod.com/discuss_apod.php?date=231222
  17. https://apod.nasa.gov/apod/ap231223.html
  18. http://www.phy.mtu.edu/faculty/Nemiroff.html
  19. http://www.phy.mtu.edu/
  20. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  21. http://www.astro.umd.edu/
  22. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  23. https://www.nasa.gov/about/highlights/HP_Privacy.html
  24. https://astrophysics.gsfc.nasa.gov/
  25. https://www.nasa.gov/
  26. https://www.nasa.gov/centers/goddard/
  27. https://science.nasa.gov/learners
  28. http://www.mtu.edu/