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 March 13
   [2]A grassy hill is seen topped by a small tree. The tree appears to be
   at the end of a bright and colorful rainbow. Please see the explanation
                       for more detailed information.

                                Rainbow Tree
                   Image Credit & Copyright: [3]Eric Houck

   Explanation: What lies at the end of a rainbow? Something different for
   everyone. For the photographer taking this picture, for example, one
   [4]end of the rainbow ended at a tree. Others nearby, though, would
   likely see the [5]rainbow end somewhere else. The reason is because a
   [6]rainbow's position depends on the observer. The center of a rainbow
   always appears in the direction [7]opposite the Sun, but that direction
   lines up differently on the horizon from different locations. This
   [8]rainbow's arc indicates that its center is about 40 [9]degrees to
   the left and slightly below the horizon, while the [10]Sun is well
   behind the camera and just above the horizon. [11]Reflections and
   refractions of sunlight from raindrops in a [12]distant storm in the
   direction of the [13]rainbow are what causes the [14]colorful bands of
   light. [15]This single exposure image was captured in early January
   [16]near Knight's Ferry, [17]California, [18]USA.

                    Tomorrow's picture: Soul of the night
     __________________________________________________________________

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    Authors & editors: [30]Robert Nemiroff ([31]MTU) & [32]Jerry Bonnell
                                 ([33]UMCP)
          NASA Official: Phillip Newman [34]Specific rights apply.
              [35]NASA Web Privacy Policy and Important Notices
                A service of: [36]ASD at [37]NASA / [38]GSFC,
                         [39]NASA Science Activation
                           & [40]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2303/RainbowTree_Houck_3198.jpg
   3. https://www.instagram.com/a_guy_named_eric/
   4. https://youtu.be/PSZxmZmBfnU
   5. https://en.wikipedia.org/wiki/Rainbow
   6. https://youtu.be/xkDhQGXqwCM
   7. https://apod.nasa.gov/apod/ap190624.html
   8. https://apod.nasa.gov/apod/ap221227.html
   9. https://www.mathsisfun.com/geometry/degrees.html
  10. https://solarsystem.nasa.gov/solar-system/sun/by-the-numbers/
  11. https://atoptics.co.uk/rainbows/primrays.htm
  12. https://apod.nasa.gov/apod/ap170226.html
  13. https://atoptics.co.uk/bows.htm
  14. https://en.wikipedia.org/wiki/Rainbow#/media/File:Rainbow1.svg
  15. https://www.instagram.com/p/CnFDoMGJCBn/
  16. https://youtu.be/HTTFCm5ueA8?t=39
  17. https://en.wikipedia.org/wiki/California
  18. https://en.wikipedia.org/wiki/United_States
  19. https://apod.nasa.gov/apod/ap230312.html
  20. https://apod.nasa.gov/apod/archivepix.html
  21. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  22. https://apod.nasa.gov/apod/lib/aptree.html
  23. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  24. https://apod.nasa.gov/apod/calendar/allyears.html
  25. https://apod.nasa.gov/apod.rss
  26. https://apod.nasa.gov/apod/lib/edlinks.html
  27. https://apod.nasa.gov/apod/lib/about_apod.html
  28. https://asterisk.apod.com/discuss_apod.php?date=230313
  29. https://apod.nasa.gov/apod/ap230314.html
  30. http://www.phy.mtu.edu/faculty/Nemiroff.html
  31. http://www.phy.mtu.edu/
  32. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  33. http://www.astro.umd.edu/
  34. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  35. https://www.nasa.gov/about/highlights/HP_Privacy.html
  36. https://astrophysics.gsfc.nasa.gov/
  37. https://www.nasa.gov/
  38. https://www.nasa.gov/centers/goddard/
  39. https://science.nasa.gov/learners
  40. http://www.mtu.edu/