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 March 21
                                      [2]
                     Star Trails and the Equinox Sunrise
  Image Credit & Copyright [3] : Juan Carlos Casado [4] (TWAN [5] , Earth and
                                  Stars [6] )
                  Acknowledgement: Andrea Rodriguez Anton [7]

Explanation: Stars trail [8]  and the Sun rises [9]  in this night and day
composite panorama made on March 19. The view looks toward the eastern horizon
from La Nava de Santiago, Spain. To create it, a continuous series of digital
frames was recorded for about two hours and combined to trace the concentric
motion of the stars through the night sky. A reflection [10] of the Earth's
rotation, star trails curve around the north celestial pole toward upper left
and the south celestial pole toward the lower right. Of course [11]  on that
day the Sun [12] was near the celestial equator, a diagonal straight line in
the wide-angle projection. A dense dimming filter was used to capture the
Sun's image every two minutes. Superimposed on the star trails it rose due
east in the morning sky. In the scene, foreground landscape and a local
prehistoric monument [13] were illuminated by full moonlight, though [14] .
The monument's corridor faces nearly to the east and the equinox sunrise.

                    Tomorrow's picture: winter sky symphony

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    Authors & editors: Robert Nemiroff [26] (MTU [27] ) & Jerry Bonnell [28]
                                  (UMCP [29] )
          NASA Official:  Phillip Newman Specific rights apply [30] .
              NASA Web Privacy Policy and Important Notices [31]
              A service of: ASD [32]  at NASA [33]  / GSFC [34]
                           & Michigan Tech. U. [35]
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Site notes:
  [1] archivepix.html
  [2] image/1903/lacara_equinocc19_jcc.jpg
  [3] lib/about_apod.html#srapply
  [4] http://www.twanight.org/casado
  [5] http://www.twanight.org
  [6] http://starryearth.com/
  [7] https://astronomerswithoutborders.org/profile...
  [8] ap190118.html
  [9] ap170705.html
  [10] ap070519.html
  [11] ap030923.htm
  [12] https://en.wikipedia.org/wiki/March_equinox
  [13] https://commons.wikimedia.org/wiki/
Fileolmen_de_L%C3%A1cara_(6901631891).jpg
  [14] https://blogs.nasa.gov/Watch_the_Skies/2019/0...
here-comes-the-sun-and-moon/
  [15] ap190320.html
  [16] archivepix.html
  [17] lib/apsubmit2015.html
  [18] lib/aptree.html
  [19] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [20] calendar/allyears.html
  [21] /apod.rss
  [22] lib/edlinks.html
  [23] lib/about_apod.html
  [24] http://asterisk.apod.com/discuss_apod.php?dat...
  [25] ap190322.html
  [26] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [27] http://www.phy.mtu.edu/
  [28] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [29] http://www.astro.umd.edu/
  [30] lib/about_apod.html#srapply
  [31] https://www.nasa.gov/about/highlights/HP_Priv...
  [32] https://astrophysics.gsfc.nasa.gov/
  [33] https://www.nasa.gov/
  [34] https://www.nasa.gov/centers/goddard/
  [35] http://www.mtu.edu/

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