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.

                                2021 June 10
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                              Circular Sun Halo
             Image Credit & [3]Copyright: [4]Vincenzo Mirabella

   Explanation: Want to see a ring around the Sun? [5]It's easy to do in
   daytime skies around the world. Created by randomly oriented ice
   crystals in thin high cirrus clouds, circular 22 degree halos are
   visible much more often than rainbows. This one was captured by smart
   phone [6]photography on May 29 near Rome, Italy. Carefully [7]blocking
   the Sun, for example with a finger tip, is usually all that it takes to
   reveal the common bright halo ring. The halo's characteristic angular
   radius is about equal to the span of your hand, thumb to little finger,
   at the end of your outstretched arm. Want to see a [8]ring of fire
   eclipse? That's harder. The spectacular annular phase of [9]today's
   (June 10) solar eclipse, known as a [10]ring of fire, is briefly
   visible only if you're standing along the Moon's narrow shadow track
   that passes over parts of northern Canada, Greenland, the Arctic, and
   eastern Russia. The solar eclipse is partial though, when seen [11]from
   broader regions, including northern Asia, Europe, and parts of the US.

                     Tomorrow's picture: Juno's Ganymede
     __________________________________________________________________

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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/2106/Vincenzo_Mirabella_20210529_134459.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. http://www.coelum.com/photo-coelum/astroimagers/mirab
   5. http://www.atoptics.co.uk/halo/checkl.htm
   6. http://www.atoptics.co.uk/halo/photo.htm
   7. http://www.atoptics.co.uk/halo/circular.htm
   8. https://apod.nasa.gov/apod/ap200615.html
   9. https://www.nasa.gov/content/june-10-2021-eclipse
  10. https://www.facebook.com/pg/APOD.Sky/photos/?tab=album&album_id=2706549852782550
  11. https://en.wikipedia.org/wiki/Solar_eclipse_of_June_10,_2021
  12. https://apod.nasa.gov/apod/ap210609.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=210610
  22. https://apod.nasa.gov/apod/ap210611.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/