                         Astronomy Picture of the Day

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                              2018 September 14
                                      [2]
                          Ice Halos at Yellowknife
            Image Credit & Copyright [3] : Stephen Bedingfield [4]

Explanation: You've probably seen [5]  a circle around the Sun before [6] .
More common than rainbows, ice halos, like a 22 degree circular halo for
example, can be easy to spot, especially if you can shade your eyes from
direct sunlight. Still it's rare to see such a diverse range of ice halos [7]
, including sundogs [8] , tangent, infralateral, and Parry arcs, all found in
this snapshot [9]  from planet Earth. The picture was quickly taken in the
late morning of September 4 from Yellowknife, Northwest Territories, Canada.
The beautiful patterns are generated as sunlight (or moonlight) [10] is
reflected and refracted in six-sided water ice crystals in Earth's atmosphere.
Of course, atmospheric ice halos in the skies of other worlds [11] are likely
to be different [12] .

                    Tomorrow's picture: meteor at mountain

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    Authors & editors: Robert Nemiroff [24] (MTU [25] ) & Jerry Bonnell [26]
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Site notes:
  [1] archivepix.html
  [2] image/1809/image1bedingfield.jpg
  [3] lib/about_apod.html#srapply
  [4] mailto: stephen @at@ skyriver .dot. ca
  [5] https://science.nasa.gov/science-news/science-at-nasa/
2002/24oct_sunrings
  [6] ap180101.html
  [7] https://www.atoptics.co.uk/halosim.htm
  [8] https://science.nasa.gov/science-news/science-at-nasa/2011/
11feb_sundogmystery
  [9] image/1809/image2bedingfield1024.jpg
  [10] ap150403.html
  [11] https://www.jpl.nasa.gov/news/news.php?feature=7140
  [12] https://www.atoptics.co.uk/halo/oworld.htm
  [13] ap180913.html
  [14] archivepix.html
  [15] lib/apsubmit2015.html
  [16] lib/aptree.html
  [17] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [18] calendar/allyears.html
  [19] /apod.rss
  [20] lib/edlinks.html
  [21] lib/about_apod.html
  [22] http://asterisk.apod.com/discuss_apod.php?date=180914
  [23] ap180915.html
  [24] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [25] http://www.phy.mtu.edu/
  [26] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [27] http://www.astro.umd.edu/
  [28] lib/about_apod.html#srapply
  [29] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [30] https://astrophysics.gsfc.nasa.gov/
  [31] https://www.nasa.gov/
  [32] https://www.nasa.gov/centers/goddard/
  [33] http://www.mtu.edu/
