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 October 11
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                          Planet Earth at Blue Hour
              Image Credit & [3]Copyright: [4]Matthias Ciprian

   Explanation: Nature photographers and other [5]fans of planet Earth
   always look forward to [6]the blue hour. That's the transition [7]in
   twilight, just before sunrise or after sunset, when the Sun is below
   the horizon but land and sky are still suffused with beautiful bluish
   hues of light. On August 8 this [8]early morning blue hour panorama
   scanned along the clear western sky, away from the impending sunrise. A
   breathtaking scene, it looks down the slopes of Mt. Whitney, from along
   the [9]John Muir Trail toward rugged peaks of planet Earth's Sierra
   Nevada mountain range. Above the horizon a faint pinkish band of back
   scattered sunlight, the anti-twilight arch or [10]Belt of Venus,
   borders the falling grey shadow of Earth itself. Subtle bands of light
   across the clear sky are anti-crepuscular rays, defined by [11]shadows
   of clouds near the sunward horizon. Actually following parallel lines
   they seem to converge along the horizon at the point opposite the
   rising Sun due to perspective.

                      Tomorrow's picture: light-weekend
     __________________________________________________________________

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    Authors & editors: [23]Robert Nemiroff ([24]MTU) & [25]Jerry Bonnell
                                 ([26]UMCP)
          NASA Official: Phillip Newman [27]Specific rights apply.
              [28]NASA Web Privacy Policy and Important Notices
                A service of: [29]ASD at [30]NASA / [31]GSFC
                           & [32]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1910/2019-08-08-JMT19_1521-Pano-Edit.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.instagram.com/matthias.ciprian/
   5. http://twanight.org/newTWAN/index.asp
   6. https://earthsky.org/earth/what-is-the-blue-hour
   7. https://apod.nasa.gov/apod/ap130406.html
   8. https://www.instagram.com/p/B3bI5EoAlkN/
   9. https://en.wikipedia.org/wiki/John_Muir_Trail
  10. https://apod.nasa.gov/apod/ap060615.html
  11. https://eol.jsc.nasa.gov/SearchPhotos/photo.pl?mission=ISS029&roll=E&frame=31270
  12. https://apod.nasa.gov/apod/ap191010.html
  13. https://apod.nasa.gov/apod/archivepix.html
  14. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  15. https://apod.nasa.gov/apod/lib/aptree.html
  16. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  17. https://apod.nasa.gov/apod/calendar/allyears.html
  18. https://apod.nasa.gov/apod.rss
  19. https://apod.nasa.gov/apod/lib/edlinks.html
  20. https://apod.nasa.gov/apod/lib/about_apod.html
  21. http://asterisk.apod.com/discuss_apod.php?date=191011
  22. https://apod.nasa.gov/apod/ap191012.html
  23. http://www.phy.mtu.edu/faculty/Nemiroff.html
  24. http://www.phy.mtu.edu/
  25. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  26. http://www.astro.umd.edu/
  27. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  28. https://www.nasa.gov/about/highlights/HP_Privacy.html
  29. https://astrophysics.gsfc.nasa.gov/
  30. https://www.nasa.gov/
  31. https://www.nasa.gov/centers/goddard/
  32. http://www.mtu.edu/