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 22
    [2]A black and white image of the Moon and a mountain are shown. Both
   are half lit by the Sun, with the other half shadowed. The half-moon is
    directly above the mountain peak. Please see the explanation for more
                            detailed information.

                        Shadows of Mountain and Moon
                Image Credit & Copyright: [3]Enzo Massa Micon

   Explanation: Can the Moon and a mountain really cast similar shadows?
   Yes, but the division between light and dark does not have to be
   aligned. Pictured, a [4]quarter moon was captured above the [5]mountain
   Grivola in [6]Italy in early October of 2022. The [7]Sun is to the
   right of the featured picturesque landscape, illuminating the right
   side of the [8]Moon in a similar way that it illuminates the right side
   of the mountain. This [9]lunar phase is called "[10]quarter" because
   the [11]lit fraction visible from [12]Earth is one quarter of the
   entire lunar surface. Digital post-processing of this single exposure
   gave both [13]gigantic objects more prominence. Capturing the
   [14]terminator of this quarter moon in [15]close alignment with nearly
   vertical mountain ridge required careful timing because the [16]Earth
   rotates once a day.

                        Tomorrow's picture: sky wide
     __________________________________________________________________

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    Authors & editors: [28]Robert Nemiroff ([29]MTU) & [30]Jerry Bonnell
                                 ([31]UMCP)
          NASA Official: Ryan Smallcomb; [32]Specific rights apply.
              [33]NASA Web Privacy Policy and Important Notices
                A service of: [34]ASD at [35]NASA / [36]GSFC,
                         [37]NASA Science Activation
                           & [38]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2401/GrivolaMoon_Micon_1600.jpg
   3. https://www.instagram.com/enzomassamicon/
   4. https://apod.nasa.gov/apod/ap041021.html
   5. https://youtu.be/Boz-IyFv1oQ?t=530
   6. https://en.wikipedia.org/wiki/Italy
   7. https://science.nasa.gov/sun/
   8. https://science.nasa.gov/moon/
   9. https://spaceplace.nasa.gov/moon-phases/
  10. https://apod.nasa.gov/apod/ap231021.html
  11. https://en.wikipedia.org/wiki/Lunar_phase
  12. https://apod.nasa.gov/apod/ap220206.html
  13. https://get.pxhere.com/photo/pet-kitten-cat-mammal-close-up-nose-whiskers-vertebrate-maine-coon-cat-cat-cat-norwegian-forest-cat-european-shorthair-burmilla-small-to-medium-sized-cats-cat-like-mammal-carnivoran-domestic-short-haired-cat-domestic-long-haired-cat-british-semi-longhair-turkish-angora-997523.jpg
  14. https://en.wikipedia.org/wiki/Terminator_(solar)
  15. https://apod.nasa.gov/apod/ap200507.html
  16. https://apod.nasa.gov/apod/ap200701.html
  17. https://apod.nasa.gov/apod/ap240121.html
  18. https://apod.nasa.gov/apod/archivepix.html
  19. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  20. https://apod.nasa.gov/apod/lib/aptree.html
  21. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  22. https://apod.nasa.gov/apod/calendar/allyears.html
  23. https://apod.com/feed.rss
  24. https://apod.nasa.gov/apod/lib/edlinks.html
  25. https://apod.nasa.gov/apod/lib/about_apod.html
  26. https://asterisk.apod.com/discuss_apod.php?date=240122
  27. https://apod.nasa.gov/apod/ap240123.html
  28. http://www.phy.mtu.edu/faculty/Nemiroff.html
  29. http://www.phy.mtu.edu/
  30. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  31. http://www.astro.umd.edu/
  32. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  33. https://www.nasa.gov/about/highlights/HP_Privacy.html
  34. https://astrophysics.gsfc.nasa.gov/
  35. https://www.nasa.gov/
  36. https://www.nasa.gov/centers/goddard/
  37. https://science.nasa.gov/learners
  38. http://www.mtu.edu/