                  APOD: 2017 November 25 - Crossing Horizons

                         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.

                               2017 November 25
                                      [2]
                              Crossing Horizons
          Image Credit & Copyright [3] : Jean-Francois Graffand [4]

Explanation: Follow this vertical panoramic view from horizon to horizon and
your gaze will sweep through the zenith of a dark night sky over Pic du Midi
mountaintop [5]  observatory. To make the journey above a sea of clouds, 19
single exposures were taken near the end of night on October 31 and assembled
in a mercator projection that renders the two horizons flat. Begin at the top
and you're looking east toward the upsidedown dome of the observatory's 1
meter telescope. It's easy to follow the plane of our Milky Way [6]  galaxy as
it appears to emerge from the dome and angle down toward the far horizon. Just
to its right, the sky holds a remarkable diffuse glow of zodiacal light along
our Solar System's ecliptic plane. Zodiacal light [7] and Milky Way with star
clusters, cosmic dust clouds and faint nebulae, cross near the zenith. Both
continue down toward the airglow in the west. They disappear near the western
horizon at the bottom, beyond more Pic du Midi observatory domes and a tall
communications relay antenna.

                Tomorrow's picture: It just takes a minute. [8]

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    Authors & editors: Robert Nemiroff [20] (MTU [21] ) & Jerry Bonnell [22]
                                  (UMCP [23] )
          NASA Official:  Phillip Newman Specific rights apply [24] .
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              A service of: ASD [26]  at NASA [27]  / GSFC [28]
                           & Michigan Tech. U. [29]
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Site notes:
  [1] archivepix.html
  [2] image/1711/horizon2horizonJFGraffand.jpg
  [3] lib/about_apod.html#srapply
  [4] https://www.facebook.com/EchoesPhotographie
  [5] ap080125.html
  [6] https://www.nasa.gov/jpl/ charting-the-milky-way-from-the-inside-out
  [7] ap140911.html
  [8] ap171126.html
  [9] ap171124.html
  [10] archivepix.html
  [11] lib/apsubmit2015.html
  [12] lib/aptree.html
  [13] http://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [14] calendar/allyears.html
  [15] /apod.rss
  [16] lib/edlinks.html
  [17] lib/about_apod.html
  [18] http://asterisk.apod.com/discuss_apod.php?date=171125
  [19] ap171126.html
  [20] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [21] http://www.phy.mtu.edu/
  [22] http://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [23] http://www.astro.umd.edu/
  [24] lib/about_apod.html#srapply
  [25] http://www.nasa.gov/about/highlights/HP_Privacy.html
  [26] http://astrophysics.gsfc.nasa.gov/
  [27] http://www.nasa.gov/
  [28] http://www.nasa.gov/centers/goddard/
  [29] http://www.mtu.edu/
