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 December 8
                            Tiny Planet Timelapse
 Video Credit & Copyright [2] : Brian Haidet [3]  - Music Credit: Space Walk -
                              Silent Partner [4]

Explanation: You can pack a lot of sky watching into 30 seconds on this tiny
planet. Of course, the full spherical image timelapse video was recorded [5]
on planet Earth [6] , from Grande Pines Observatory [7]  outside Pinehurst,
North Carolina. It was shot in early September with a single camera and
circular fisheye lens, digitally combining one 24-hour period with camera and
lens pointed up with one taken with camera and lens pointed down. The
resulting image data is processed and projected onto a flat frame centered on
the nadir [8] , the point directly below the camera. Watch as clouds pass,
shadows creep, and the sky cycles from day to night when stars swirl around
the horizon. Keep watching, though. In a second sequence the projected center
is the south celestial pole [9] , planet Earth's axis of rotation below the
tiny planet horizon. Holding the stars fixed, the horizon itself rotates as
the tiny planet swings around the frame, hiding half the sky through day and
night [10] .

                        Tomorrow's picture: sky dance

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    Authors & editors: Robert Nemiroff [22] (MTU [23] ) & Jerry Bonnell [24]
                                  (UMCP [25] )
          NASA Official:  Phillip Newman Specific rights apply [26] .
              NASA Web Privacy Policy and Important Notices [27]
              A service of: ASD [28]  at NASA [29]  / GSFC [30]
                           & Michigan Tech. U. [31]
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Site notes:
  [1] archivepix.html
  [2] lib/about_apod.html#srapply
  [3] https://www.flickr.com/photos/144439286@N08
  [4] https://soundcloud.com/royaltyfreemusic-nocopyrightmusic/
space-walk-silent-partner-free-download
  [5] https://www.youtube.com/watch?v=QizgzcZzu_8
  [6] https://earthobservatory.nasa.gov/
  [7] https://www.youtube.com/watch?v=j1llWnhX1-c
  [8] https://en.wikipedia.org/wiki/ Nadir#/media/File:Zenith-Nadir-Horizon.svg
  [9] ap120802.html
  [10] ap151016.html
  [11] ap181207.html
  [12] archivepix.html
  [13] lib/apsubmit2015.html
  [14] lib/aptree.html
  [15] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [16] calendar/allyears.html
  [17] /apod.rss
  [18] lib/edlinks.html
  [19] lib/about_apod.html
  [20] http://asterisk.apod.com/discuss_apod.php?date=181208
  [21] ap181209.html
  [22] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [23] http://www.phy.mtu.edu/
  [24] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [25] http://www.astro.umd.edu/
  [26] lib/about_apod.html#srapply
  [27] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [28] https://astrophysics.gsfc.nasa.gov/
  [29] https://www.nasa.gov/
  [30] https://www.nasa.gov/centers/goddard/
  [31] http://www.mtu.edu/

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