        APOD: 2018 March 20 - Chicagohenge: Equinox in an Aligned City

                         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 March 20
                                      [2]
                  Chicagohenge: Equinox in an Aligned City
                 Image Credit & Copyright: Anthony Artese [3]

Explanation: Sometimes, in a way, Chicago is like a modern Stonehenge [4] .
The way is east to west, and the time is today. Today, and every equinox [5] ,
the Sun [6]  will set exactly to the west, everywhere on Earth [7] .
Therefore, today in Chicago [8] , the Sun will set directly down the long
equatorially-aligned grid of streets [9]  and buildings, an event dubbed
#chicagohenge [10] . Featured here [11]  is a Chicago Henge [12] picture taken
during the last equinox [13]  in mid-September of 2017 looking along part of
Upper Wacker Drive [14] . Many cities [15] , though, have streets [16]  or
other features [17]  that are well-aligned [18]  to Earth's spin axis.
Therefore, quite possibly, your favorite street [19]  may also run east -
west. Tonight at sunset, with a quick glance, you can actually find out [20] .

                 Tomorrow's picture: beyond human vision [21]

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    Authors & editors: Robert Nemiroff [33] (MTU [34] ) & Jerry Bonnell [35]
                                  (UMCP [36] )
          NASA Official:  Phillip Newman Specific rights apply [37] .
              NASA Web Privacy Policy and Important Notices [38]
              A service of: ASD [39]  at NASA [40]  / GSFC [41]
                           & Michigan Tech. U. [42]
----------
Site notes:
  [1] archivepix.html
  [2] image/1803/Chicagohenge_Artese_1320.jpg
  [3] https://twitter.com/anthony_artese
  [4] https://en.wikipedia.org/wiki/Stonehenge
  [5] ap170319.html
  [6] https://solarsystem.nasa.gov/solar-system/sun/overview/
  [7] https://solarsystem.nasa.gov/planets/earth/overview/
  [8] https://en.wikipedia.org/wiki/Chicago
  [9] https://www.domu.com/blog/decoding-the-chicago-street-grid-system
  [10] https://twitter.com/search?q=%23chicagohenge
  [11] https://twitter.com/anthony_artese/status/910309187049148417
  [12]
http://www.chicagotribune.com/news/
ct-viewing-chicagohenge-when-and-how-it-works-20150922s-htmlstory.html
  [13]
https://mynasadata.larc.nasa.gov/oyw/wp-content/uploads/2012/04/seasons.jpg
  [14] https://en.wikipedia.org/wiki/Wacker_Drive
  [15]
https://www.citylab.com/transportation/2016/03/
mapping-street-numbering-us-new-york-philadelphia/472809/
  [16] ap160320.html
  [17] ap170621.html
  [18] ap140706.html
  [19]
http://static.boredpanda.com/blog/wp-content/uploads/2016/01/
police-rescue-sloth-cross-highway-ecuador-6.jpg
  [20]
http://expatchild.com/wp-content/uploads/2013/06/
Resilient-expat-child-Toddler-with-hands-on-hips-looking-down-a-long-road-
e1421274394294.jpg
  [21] ap180321.html
  [22] ap180319.html
  [23] archivepix.html
  [24] lib/apsubmit2015.html
  [25] lib/aptree.html
  [26] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [27] calendar/allyears.html
  [28] /apod.rss
  [29] lib/edlinks.html
  [30] lib/about_apod.html
  [31] http://asterisk.apod.com/discuss_apod.php?date=180320
  [32] ap180321.html
  [33] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [34] http://www.phy.mtu.edu/
  [35] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [36] http://www.astro.umd.edu/
  [37] lib/about_apod.html#srapply
  [38] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [39] https://astrophysics.gsfc.nasa.gov/
  [40] https://www.nasa.gov/
  [41] https://www.nasa.gov/centers/goddard/
  [42] http://www.mtu.edu/
