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 __________________________________________________________________ [19]< | [20]Archive | [21]Submissions | [22]Index | [23]Search | [24]Calendar | [25]RSS | [26]Education | [27]About APOD | [28]Discuss | [29]> __________________________________________________________________ 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/