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.

                                 2022 July 2
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                           Solargraphic Analemmas
          Image Credit & [3]Copyright: Dawid Rycabel ([4]Pinholove)

   Explanation: For the northern hemisphere June 21 was the summer
   solstice, [5]the Sun reaching its northernmost declination for the
   year. That would put it at the top of each of these three [6]figure-8
   curves, or analemmas, as it passed through the daytime sky over the
   village of Proboszczow, Poland. No sequence of digital exposures was
   used to construct the remarkable image though. [7]Using a pinhole
   camera fixed to face south during the period June 26, 2021 to June 26,
   2022, the image was formed directly on a single sheet of photographic
   paper, a [8]technique known as solargraphy. The three analemmas are the
   result of briefly exposing the photo paper through the pinhole each day
   at 11:00, 12:00, and 13:00 CET. Groups of dashed lines on the sides
   show partial tracks of the Sun from daily exposures made every 15
   minutes. Over the year-long [9]solargraphic photo opportunity clouds
   blocking the Sun during the pinhole exposures created the dark gaps.

                   Tomorrow's picture: doomed moon of Mars
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    Authors & editors: [21]Robert Nemiroff ([22]MTU) & [23]Jerry Bonnell
                                 ([24]UMCP)
          NASA Official: Phillip Newman [25]Specific rights apply.
              [26]NASA Web Privacy Policy and Important Notices
                A service of: [27]ASD at [28]NASA / [29]GSFC
                           & [30]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2207/Analemma1.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.instagram.com/pinholove_com
   5. https://earthobservatory.nasa.gov/images/52248/seeing-equinoxes-and-solstices-from-space
   6. https://apod.nasa.gov/apod/ap190621.html
   7. https://www.youtube.com/watch?v=djc1kK7UzgY
   8. https://www.alternativephotography.com/solargraphy-catching-the-suns-path-pinhole-camera/
   9. https://analemma.pl/english-version
  10. https://apod.nasa.gov/apod/ap220701.html
  11. https://apod.nasa.gov/apod/archivepix.html
  12. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  13. https://apod.nasa.gov/apod/lib/aptree.html
  14. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  15. https://apod.nasa.gov/apod/calendar/allyears.html
  16. https://apod.nasa.gov/apod.rss
  17. https://apod.nasa.gov/apod/lib/edlinks.html
  18. https://apod.nasa.gov/apod/lib/about_apod.html
  19. http://asterisk.apod.com/discuss_apod.php?date=220702
  20. https://apod.nasa.gov/apod/ap220703.html
  21. http://www.phy.mtu.edu/faculty/Nemiroff.html
  22. http://www.phy.mtu.edu/
  23. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  24. http://www.astro.umd.edu/
  25. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  26. https://www.nasa.gov/about/highlights/HP_Privacy.html
  27. https://astrophysics.gsfc.nasa.gov/
  28. https://www.nasa.gov/
  29. https://www.nasa.gov/centers/goddard/
  30. http://www.mtu.edu/