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                        Astronomy Picture of the Day

   [1]Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                                2020 April 8
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                         Country Sky versus City Sky
       Image Credit & Copyright: [3]Tomas Slovinsky; Text: [4]Matipon
                           Tangmatitham ([5]NARIT)

   Explanation: Dark skies are [6]disappearing from the world. With
   modernization comes [7]artificial lighting that brightens the night.
   While these lights allow [8]modern humans to see, much light is
   [9]wasted up into the sky. This [10]light pollution not only [11]wastes
   energy, but, when reflected by the Earth's atmosphere back down,
   creates a nighttime brightness that [12]disrupts wildlife and [13]harms
   human health, while doing very little to [14]prevent crime. Light
   pollution is also making a dark night sky a [15]scarcity for new
   generations. While there is little that can be done in large cities,
   rural country areas could benefit from [16]lighting that is fully
   shielded from exposing the [17]night sky where it is not needed. The
   featured panorama contains 6 adjacent vertical segments taken from
   different locations across [18]Slovakia -- but with the same equipment
   and at the same time of night, and then subjected to the same
   [19]digital post-processing. Although no stars are visible on the
   left-most city sky, the right-most country sky is [20]magnificently
   dark. You can help protect the wonders of your night sky by favoring,
   when possible, [21]dark sky friendly lightning.

                       Tomorrow's picture: open space
     __________________________________________________________________

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    Authors & editors: [33]Robert Nemiroff ([34]MTU) & [35]Jerry Bonnell
                                 ([36]UMCP)
          NASA Official: Phillip Newman [37]Specific rights apply.
              [38]NASA Web Privacy Policy and Important Notices
                A service of: [39]ASD at [40]NASA / [41]GSFC
                           & [42]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2004/LightPollutionPan_Slovinsky_2048.jpg
   3. http://slovinsky.art/en/homeen/
   4. https://www.facebook.com/matiponblog/
   5. http://narit.or.th/
   6. https://www.nationalgeographic.com/science/2019/04/nights-are-getting-brighter-earth-paying-the-price-light-pollution-dark-skies/
   7. https://en.wikipedia.org/wiki/Lighting
   8. https://apod.nasa.gov/apod/ap190818.html
   9. https://earthobservatory.nasa.gov/features/NightLights
  10. https://www.lightpollutionmap.info/
  11. https://www.darksky.org/light-pollution/energy-waste/
  12. https://www.darksky.org/light-pollution/wildlife/
  13. https://www.darksky.org/light-pollution/human-health/
  14. https://www.darksky.org/light-pollution/lighting-crime-and-safety/
  15. https://osr.org/blog/astronomy/seen-milky-way-people-cant/
  16. https://nightsky.jpl.nasa.gov/news-display.cfm?News_ID=745
  17. https://apod.nasa.gov/apod/ap190516.html
  18. https://en.wikipedia.org/wiki/Slovakia
  19. http://reed.cs.depaul.edu/peterh/class/hci450/imgs/pc.png
  20. https://apod.nasa.gov/apod/ap080416.html
  21. https://www.darksky.org/our-work/lighting/lighting-for-citizens/lighting-basics/
  22. https://apod.nasa.gov/apod/ap200407.html
  23. https://apod.nasa.gov/apod/archivepix.html
  24. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  25. https://apod.nasa.gov/apod/lib/aptree.html
  26. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  27. https://apod.nasa.gov/apod/calendar/allyears.html
  28. https://apod.nasa.gov/apod.rss
  29. https://apod.nasa.gov/apod/lib/edlinks.html
  30. https://apod.nasa.gov/apod/lib/about_apod.html
  31. http://asterisk.apod.com/discuss_apod.php?date=200408
  32. https://apod.nasa.gov/apod/ap200409.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. https://apod.nasa.gov/apod/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/