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.

                               2024 January 25
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                           Jyväskylä in the Sky
               Image Credit & [3]Copyright: [4]Harri Kiiskinen

   Explanation: You might not immediately recognize this street map of
   [5]a neighborhood in Jyväskylä, Finland, [6]planet Earth. But that's
   probably because the map was projected into the night sky and captured
   with an allsky camera on January 16. The temperature recorded on that
   northern winter night was around minus 20 degrees Celsius. As ice
   crystals formed in the atmosphere overhead, street lights spilling
   illumination into the sky above produced [7]visible light pillars,
   their ethereal appearance due to [8]specular reflections from the
   fluttering crystals' flat surfaces. Of course, the projected light
   pillars trace a map of the brightly lit local streets, though
   [9]reversed right to left in the upward looking camera's view. This
   light pillar street map was seen to hover for hours in [10]the
   Jyväskylä night.

                    Tomorrow's picture: star with planet
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    Authors & editors: [22]Robert Nemiroff ([23]MTU) & [24]Jerry Bonnell
                                 ([25]UMCP)
          NASA Official: Amber Straughn [26]Specific rights apply.
              [27]NASA Web Privacy Policy and Important Notices
                A service of: [28]ASD at [29]NASA / [30]GSFC,
                         [31]NASA Science Activation
                           & [32]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2401/image-20240116164558_v1.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. mailto: hapakiiskkinen(gmail)
   5. https://www.google.com/maps/@62.205288,25.7794447,16z?entry=ttu
   6. https://earthobservatory.nasa.gov/
   7. https://atoptics.co.uk/blog/light-pillars/
   8. https://apod.nasa.gov/apod/ap220924.html
   9. https://apod.nasa.gov/apod/image/2401/image-20240116214224_h.jpg
  10. https://jyv-weather.info/allsky/videos/allsky-20240116.mp4
  11. https://apod.nasa.gov/apod/ap240124.html
  12. https://apod.nasa.gov/apod/archivepix.html
  13. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  14. https://apod.nasa.gov/apod/lib/aptree.html
  15. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  16. https://apod.nasa.gov/apod/calendar/allyears.html
  17. https://apod.nasa.gov/apod.rss
  18. https://apod.nasa.gov/apod/lib/edlinks.html
  19. https://apod.nasa.gov/apod/lib/about_apod.html
  20. http://asterisk.apod.com/discuss_apod.php?date=240125
  21. https://apod.nasa.gov/apod/ap240126.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. https://apod.nasa.gov/apod/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. https://science.nasa.gov/learners
  32. http://www.mtu.edu/