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.

                                2019 January 18
                                      [2]
                           Circumpolar Star Trails
               Image Credit & Copyright [3] : Gabriel Funes [4]

Explanation: As Earth [5]  spins on its axis, the stars appear to rotate
around an observatory in this well-composed image from the Canary Island of
Tenerife. Of course, the colorful concentric arcs traced out by the stars are
really centered on the planet's North Celestial Pole. Convenient [6]  for
northern hemisphere astro-imagers and celestial navigators alike, bright star
Polaris is near [7]  the pole and positioned in this scene to be behind the
telescope dome. Made with [8] a camera fixed to a tripod, the series of over
200 stacked digital exposures spanned about 4 hours. The observatory was not
operating on that clear, dark night, but that's not surprising. The dome
houses the Teide Observatory's large THEMIS Solar Telescope [9] .

                      Tomorrow's picture: light-weekend

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    Authors & editors: Robert Nemiroff [21] (MTU [22] ) & Jerry Bonnell [23]
                                  (UMCP [24] )
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                           & Michigan Tech. U. [30]
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Site notes:
  [1] archivepix.html
  [2] image/1901/Startrail_Funes.jpg
  [3] lib/about_apod.html#srapply
  [4] mailto: gfunpol [at] gmail [dot] com
  [5] https://www.nasa.gov/image-feature/ star-trails-seen-from-low-earth-orbit
  [6] ap131023.html
  [7] ap110514.html
  [8] ap070519.html
  [9] http://www.iac.es/eno.php?op1=3&op2=6&id=2&la...
  [10] ap190117.html
  [11] archivepix.html
  [12] lib/apsubmit2015.html
  [13] lib/aptree.html
  [14] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [15] calendar/allyears.html
  [16] /apod.rss
  [17] lib/edlinks.html
  [18] lib/about_apod.html
  [19] http://asterisk.apod.com/discuss_apod.php?dat...
  [20] ap190119.html
  [21] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [22] http://www.phy.mtu.edu/
  [23] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [24] http://www.astro.umd.edu/
  [25] lib/about_apod.html#srapply
  [26] https://www.nasa.gov/about/highlights/HP_Priv...
  [27] https://astrophysics.gsfc.nasa.gov/
  [28] https://www.nasa.gov/
  [29] https://www.nasa.gov/centers/goddard/
  [30] http://www.mtu.edu/

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