            APOD: 2017 November 7 - The Prague Astronomical Clock

                         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 7
                                      [2]
                        The Prague Astronomical Clock
                Image Credit & License [3] : Jorge Láscar [4]

Explanation: In the center of Prague there's a clock the size of a building.
During the day, crowds gather to watch the show [5]  when it chimes in a new
hour. The Prague Astronomical Clock [6] 's face is impressively complex [7] ,
giving not only the expected time with respect to the Sun (solar time [8] ),
but the time relative to the stars (sidereal time [9] ), the times of sunrise
and sunset, the time at the equator, the phase of the Moon, and much more. The
clock began operation in 1410 [10] , and even though much of its inner
workings have been modernized several times [11] , original parts remain.
Below the clock is a nearly-equal sized [12] , but static, solar calendar [13]
. Pictured, the Prague Astronomical Clock [14]  was photographed alone during
an early morning in 2009 March. The Prague Astronomical Clock and the Old Town
Tower [15] behind it are currently being renovated once again, with the clock
expected to be restarted in 2018 June [16] .

                  Tomorrow's picture: a changing nebula [17]

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    Authors & editors: Robert Nemiroff [29] (MTU [30] ) & Jerry Bonnell [31]
                                  (UMCP [32] )
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              A service of: ASD [35]  at NASA [36]  / GSFC [37]
                           & Michigan Tech. U. [38]
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Site notes:
  [1] archivepix.html
  [2] image/1711/PragueClock_Lascar_3216.jpg
  [3] https://creativecommons.org/licenses/by/2.0/deed.en
  [4] https://www.flickr.com/people/8721758@N06
  [5] https://www.youtube.com/watch?v=QAq_0y4uhi4
  [6] https://en.wikipedia.org/wiki/Prague_astronomical_clock
  [7]
https://en.wikipedia.org/wiki/Prague_astronomical_clock#/media/
File:Schema_Orloj_en.png
  [8] https://en.wikipedia.org/wiki/Solar_time
  [9] https://en.wikipedia.org/wiki/Sidereal_time
  [10] http://www.orloj.eu/en/orloj_historie.htm
  [11] http://www.orloj.eu/en/orloj_osobnosti.htm
  [12]
https://en.wikipedia.org/wiki/Prague_astronomical_clock#/media/
File:Prag_-_Rathausuhr_Monatsarbeiten.jpg
  [13]
https://images.chinahighlights.com/allpicture/2014/10/
dd34dc173c7c4dfbbf2cb4b9.jpg
  [14] https://www.youtube.com/watch?v=NebyX6-GUTM
  [15] http://www.prague.cz/old-town-city-hall/
  [16]
https://www.czechtourism.com/p/sc-prague-astronomical-clock-will-be-repaired/
  [17] ap171108.html
  [18] ap171106.html
  [19] archivepix.html
  [20] lib/apsubmit2015.html
  [21] lib/aptree.html
  [22] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [23] calendar/allyears.html
  [24] /apod.rss
  [25] lib/edlinks.html
  [26] lib/about_apod.html
  [27] http://asterisk.apod.com/discuss_apod.php?date=171107
  [28] ap171108.html
  [29] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [30] http://www.phy.mtu.edu/
  [31] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [32] http://www.astro.umd.edu/
  [33] lib/about_apod.html#srapply
  [34] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [35] https://astrophysics.gsfc.nasa.gov/
  [36] https://www.nasa.gov/
  [37] https://www.nasa.gov/centers/goddard/
  [38] http://www.mtu.edu/
