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 September 23
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                 Equinox: The Sun from Solstice to Solstice
             Image Credit & Copyright: [3]Tunç Tezel ([4]TWAN)

   Explanation: Today is an equinox, a date when day and night are equal.
   Tomorrow, and every day until the next [5]equinox, the night will be
   longer than the day in Earth's northern hemisphere, and the day will be
   longer than the night in Earth's southern hemisphere. An [6]equinox
   occurs midway between the two [7]solstices, when the days and nights
   are the least equal. The featured picture is a composite of hourly
   images taken of the Sun above [8]Bursa, [9]Turkey on key days from
   solstice to [10]equinox to solstice. The bottom Sun band was taken
   during the north's [11]winter solstice in 2007 December, when the Sun
   could not rise very high in the sky nor stay above the horizon very
   long. This lack of Sun caused [12]winter. The top [13]Sun band was
   taken during the northern [14]summer solstice in 2008 June, when the
   Sun rose highest in the sky and stayed above the horizon for more than
   12 hours. This abundance of Sun caused [15]summer. The middle band was
   taken during an [16]equinox in 2008 March, but it is the same sun band
   that [17]Earthlings see today, the day of the most recent [18]equinox.

   Browser-Enhanced APOD: [19]Google Chrome extensions (free, user created
                               and maintained)
                  Tomorrow's picture: martian dunes thawing
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    Authors & editors: [31]Robert Nemiroff ([32]MTU) & [33]Jerry Bonnell
                                 ([34]UMCP)
          NASA Official: Phillip Newman [35]Specific rights apply.
              [36]NASA Web Privacy Policy and Important Notices
                A service of: [37]ASD at [38]NASA / [39]GSFC
                           & [40]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1909/seasons_tezel_1080.jpg
   3. http://www.twanight.org/newTWAN/photographers_about.asp?photographer=Tunc Tezel
   4. http://www.twanight.org/
   5. https://en.wikipedia.org/wiki/Equinox
   6. https://apod.nasa.gov/apod/ap040320.html
   7. https://en.wikipedia.org/wiki/Solstice
   8. https://en.wikipedia.org/wiki/Bursa
   9. https://en.wikipedia.org/wiki/Turkey
  10. https://www.youtube.com/watch?v=DSdDeooDQEY
  11. https://apod.nasa.gov/apod/ap071222.html
  12. https://apod.nasa.gov/apod/ap041130.html
  13. https://solarsystem.nasa.gov/solar-system/sun/overview/
  14. https://apod.nasa.gov/apod/ap060621.html
  15. https://apod.nasa.gov/apod/ap080705.html
  16. https://apod.nasa.gov/apod/ap190320.html
  17. https://apod.nasa.gov/apod/ap080421.html
  18. https://blogs.nasa.gov/Watch_the_Skies/tag/equinox/
  19. https://chrome.google.com/webstore/search/"Astronomy Picture of the Day"?_feature=free&_category=extensions
  20. https://apod.nasa.gov/apod/ap190922.html
  21. https://apod.nasa.gov/apod/archivepix.html
  22. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  23. https://apod.nasa.gov/apod/lib/aptree.html
  24. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  25. https://apod.nasa.gov/apod/calendar/allyears.html
  26. https://apod.nasa.gov/apod.rss
  27. https://apod.nasa.gov/apod/lib/edlinks.html
  28. https://apod.nasa.gov/apod/lib/about_apod.html
  29. http://asterisk.apod.com/discuss_apod.php?date=190923
  30. https://apod.nasa.gov/apod/ap190924.html
  31. http://www.phy.mtu.edu/faculty/Nemiroff.html
  32. http://www.phy.mtu.edu/
  33. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  34. http://www.astro.umd.edu/
  35. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  36. https://www.nasa.gov/about/highlights/HP_Privacy.html
  37. https://astrophysics.gsfc.nasa.gov/
  38. https://www.nasa.gov/
  39. https://www.nasa.gov/centers/goddard/
  40. http://www.mtu.edu/