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.

                                 2025 June 5
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                            Savudrija Star Trails
                 Image Credit & [3]Copyright: [4]Branko Nadj

   Explanation: [5]Savudrija lighthouse shines along the coast near the
   northern end of the Istrian peninsula in this well-composed [6]night
   skyscape. A navigational aid for sailors on the Adriatic Sea, the
   historic lighthouse was constructed in the early 19th century. But an
   even older aid to navigation shines in the sky above, [7]Polaris, alpha
   star of the constellation Ursa Minor and also known as the North Star.
   In this scene Polaris forms the shortest bright arc near the [8]North
   Celestial Pole, the extension of Earth's axis of rotation into space.
   Of course, the North Celestial Pole lies exactly at the center of all
   the concentric startrails. [9]The composite image is a digital stack of
   400 exposures, each 30 seconds long, taken with camera and tripod fixed
   to a rotating planet.

                     Tomorrow's picture: pixels in space
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    Authors & editors: [21]Robert Nemiroff ([22]MTU) & [23]Jerry Bonnell
                                 ([24]UMCP)
          NASA Official: Amber Straughn [25]Specific rights apply.
              [26]NASA Web Privacy Policy and Important Notices
                A service of: [27]ASD at [28]NASA / [29]GSFC,
                         [30]NASA Science Activation
                           & [31]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2506/SavudrijaSTARTRAILS_Nadj.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.instagram.com/bnastro000/
   5. https://en.wikipedia.org/wiki/Savudrija_Lighthouse
   6. https://science.nasa.gov/solar-system/skywatching/whats-up-june-2025-skywatching-tips-from-nasa/
   7. https://apod.nasa.gov/apod/ap110514.html
   8. https://apod.nasa.gov/apod/ap220728.html
   9. https://www.instagram.com/bnastro000/p/DKJjsZdNOQJ/?img_index=1
  10. https://apod.nasa.gov/apod/ap250604.html
  11. https://apod.nasa.gov/apod/archivepix.html
  12. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  13. https://apod.nasa.gov/apod/lib/aptree.html
  14. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  15. https://apod.nasa.gov/apod/calendar/allyears.html
  16. https://apod.nasa.gov/apod.rss
  17. https://apod.nasa.gov/apod/lib/edlinks.html
  18. https://apod.nasa.gov/apod/lib/about_apod.html
  19. http://asterisk.apod.com/discuss_apod.php?date=250605
  20. https://apod.nasa.gov/apod/ap250606.html
  21. http://www.phy.mtu.edu/faculty/Nemiroff.html
  22. http://www.phy.mtu.edu/
  23. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  24. http://www.astro.umd.edu/
  25. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  26. https://www.nasa.gov/about/highlights/HP_Privacy.html
  27. https://astrophysics.gsfc.nasa.gov/
  28. https://www.nasa.gov/
  29. https://www.nasa.gov/centers/goddard/
  30. https://science.nasa.gov/learners
  31. http://www.mtu.edu/