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.

                                2026 April 22

    IFRAME: [2]https://youtube.com/embed/MT8tg5b3b8E?si=46r2TF9THNvtq1ep

                           Earthset with an iPhone
                      Video Credit: NASA, Reid Wiseman
   Text: [3]Keighley Rockcliffe ([4]NASA [5]GSFC, [6]UMBC CSST, [7]CRESST
                                     II)

   Explanation: What does it mean for [8]the Earth to set? Artemis II
   Commander Reid Wiseman gave us [9]another spectacular view of Earth
   from their historic flyby of the Moon. [10]Commander Wiseman's video,
   taken with an iPhone at 8x zoom, shows our entire planet gradually
   blocked from view by the Moon. On the Earth, the 24-hour planetary
   rotation causes the Sun to set below your horizon every night. However,
   on Artemis II [11]the Earthset was caused not by [12]the Moon’s
   rotation but by the spacecraft moving behind the Moon (at about 55
   seconds in [13]this video). Once rare, views of Earth are now taken
   many times a day from many spacecraft, including NASA’s [14]SWOT
   (Surface Water and Ocean Topography) satellite tracking freshwater
   resources and [15]USGS Landsat 8 and 9 satellites [16]supporting water
   management for farmers, for example. Space agencies around our home
   planet now work together to provide unique and ever-improving [17]views
   of our Earth.

                          Celebrate: [18]Earth Day
                       Tomorrow's picture: placeholder
     __________________________________________________________________

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    Authors & editors: [30]Robert Nemiroff ([31]MTU) & [32]Jerry Bonnell
                                 ([33]UMCP)
          NASA Official: Amber Straughn [34]Specific rights apply.
            [35]NASA Web Privacy, [36]Accessibility, [37]Notices;
                A service of: [38]ASD at [39]NASA / [40]GSFC,
                         [41]NASA Science Activation
                           & [42]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://youtube.com/embed/MT8tg5b3b8E?si=46r2TF9THNvtq1ep
   3. https://kerockcliffe.com/
   4. https://science.gsfc.nasa.gov/sci/bio/keighley.e.rockcliffe
   5. https://www.nasa.gov/goddard/
   6. https://csst.umbc.edu/directory/
   7. https://cresst2.umd.edu/
   8. https://science.nasa.gov/earth/
   9. https://apod.nasa.gov/apod/ap260404.html
  10. https://www.instagram.com/reel/DXVMcEqDnYS/?igsh=OG1oejExcDlzM3p6
  11. https://apod.nasa.gov/apod/ap260408.html
  12. https://science.nasa.gov/resource/the-moons-rotation/
  13. https://apod.nasa.gov/apod/ap260406.html
  14. https://swot.jpl.nasa.gov/
  15. https://science.nasa.gov/mission/landsat/
  16. https://science.nasa.gov/science-research/earth-science/water-energy-cycle/openet-moisture-measurement-tool-is-proving-highly-accurate/
  17. https://science.nasa.gov/earth/earth-observatory/image-of-the-day/
  18. https://science.nasa.gov/earth/earth-day/earth-day-toolkit/
  19. https://apod.nasa.gov/apod/ap260421.html
  20. https://apod.nasa.gov/apod/archivepix.html
  21. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  22. https://apod.nasa.gov/apod/lib/aptree.html
  23. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  24. https://apod.nasa.gov/apod/calendar/allyears.html
  25. https://apod.com/feed.rss
  26. https://apod.nasa.gov/apod/lib/edlinks.html
  27. https://apod.nasa.gov/apod/lib/about_apod.html
  28. https://asterisk.apod.com/discuss_apod.php?date=260422
  29. https://apod.nasa.gov/apod/ap260423.html
  30. http://www.phy.mtu.edu/faculty/Nemiroff.html
  31. http://www.phy.mtu.edu/
  32. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  33. http://www.astro.umd.edu/
  34. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  35. https://www.nasa.gov/about/highlights/HP_Privacy.html
  36. https://www.nasa.gov/general/accessibility/
  37. https://www.nasa.gov/privacy/
  38. https://astrophysics.gsfc.nasa.gov/
  39. https://www.nasa.gov/
  40. https://www.nasa.gov/centers/goddard/
  41. https://science.nasa.gov/learners
  42. http://www.mtu.edu/