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.

                              2019 December 21
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                  Solstice to Solstice Solargraph Timelapse
                Image Credit & [3]Copyright: [4]Sam Cornwell

   Explanation: [5]The 2019 December Solstice, on the first day of winter
   in planet Earth's northern hemisphere and summer in the south, is at
   4:19 Universal Time December 22. That's December 21 for North America,
   though. [6]Celebrate with a timelapse animation of the Sun's seasonal
   progression through the sky. It was made [7]with solargraph images from
   an ingenious array of 27 pinhole cameras. The first frame from the
   [8]Solarcan camera matrix was recorded near December 21, 2018. The last
   frame in the series finished near June 21, 2019, the northern summer
   solstice. All 27 camera exposures were started at the same time, with a
   camera covered and removed from the array once a week. Viewed
   consecutively the pinhole camera pictures accumulate the traces of the
   Sun's daily path from winter (bottom) to summer (top) solstice. Traces
   of the Sun's path are reflected by the foreground Williestruther Loch,
   in the Scottish Borders. Just select the image or follow this link to
   [9]play the entire 27 frame (gif) timelapse.

                      Tomorrow's picture: a year of sky
     __________________________________________________________________

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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/1912/solarcanMatrixSolstice.gif
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://twitter.com/Samcornwell
   5. https://earthsky.org/astronomy-essentials/everything-you-need-to-know-december-solstice
   6. https://visibleearth.nasa.gov/images/52248/seeing-equinoxes-and-solstices-from-space
   7. https://apod.nasa.gov/apod/ap190627.html
   8. https://petapixel.com/2019/07/17/this-is-the-worlds-first-solargraphy-timelapse/
   9. https://apod.nasa.gov/apod/image/1912/solarcanMatrixSolstice.gif
  10. https://apod.nasa.gov/apod/ap191220.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=191221
  20. https://apod.nasa.gov/apod/ap191222.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/