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.

                               2021 October 18
     [2]The picture shows the sky over Sicily, Italy earlier this month
    featuring a crescent moon with Earthshine, Venus, and Antares. Please
             see the explanation for more detailed information.

                         Earthshine Moon over Sicily
                Image Credit & Copyright: [3]Dario Giannobile

   Explanation: Why can we see the entire face of this Moon? When the
   [4]Moon is in a crescent phase, only part of it appears directly
   illuminated by the [5]Sun. The answer is [6]earthshine, also known as
   [7]earthlight and the [8]da Vinci glow. The reason is that the rest of
   the [9]Earth-facing Moon is slightly illuminated by sunlight first
   reflected from the Earth. Since the Earth appears near full phase from
   the [10]Moon -- when the [11]Moon appears as a slight crescent from the
   Earth -- [12]earthshine is then near its brightest. Featured here in
   combined, consecutively-taken, [13]HDR images taken earlier this month,
   a [14]rising earthshine Moon was captured passing slowly near the
   [15]planet Venus, the brightest spot near the image center. Just above
   Venus is the star [16]Dschubba (catalogued as [17]Delta Scorpii), while
   the red star on the far left is [18]Antares. The [19]celestial show is
   visible through scenic cloud decks. In the foreground are the lights
   from [20]Palazzolo Acreide, a [21]city with ancient [22]historical
   roots in [23]Sicily, [24]Italy.

                  Tomorrow's picture: colorful star cluster
     __________________________________________________________________

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    Authors & editors: [36]Robert Nemiroff ([37]MTU) & [38]Jerry Bonnell
                                 ([39]UMCP)
          NASA Official: Phillip Newman [40]Specific rights apply.
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                A service of: [42]ASD at [43]NASA / [44]GSFC
                           & [45]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2110/EarthshineSky_Giannobile_1212.jpg
   3. https://www.instagram.com/dariogiannobile/
   4. https://moon.nasa.gov/
   5. https://solarsystem.nasa.gov/solar-system/sun/in-depth/
   6. https://earthobservatory.nasa.gov/images/83782/earthshine
   7. https://en.wikipedia.org/wiki/Earthlight_(astronomy)
   8. https://apod.nasa.gov/apod/ap190504.html
   9. https://apod.nasa.gov/apod/ap210111.html
  10. https://solarsystem.nasa.gov/moons/earths-moon/overview/
  11. https://apod.nasa.gov/apod/ap200316.html
  12. https://www.timeanddate.com/astronomy/earthshine.html
  13. https://en.wikipedia.org/wiki/High_dynamic_range
  14. https://apod.nasa.gov/apod/ap211010.html
  15. https://www.nasa.gov/venus
  16. http://stars.astro.illinois.edu/sow/dschubba.html
  17. https://en.wikipedia.org/wiki/Delta_Scorpii
  18. https://youtu.be/cw_IKaBokm0
  19. https://images.unsplash.com/photo-1520168133788-3c084821ec1f
  20. https://youtu.be/Z9qOUcRYdqo
  21. https://en.wikipedia.org/wiki/Palazzolo_Acreide#History
  22. https://whc.unesco.org/en/list/1024/
  23. https://en.wikipedia.org/wiki/Sicily
  24. https://en.wikipedia.org/wiki/Italy
  25. https://apod.nasa.gov/apod/ap211017.html
  26. https://apod.nasa.gov/apod/archivepix.html
  27. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  28. https://apod.nasa.gov/apod/lib/aptree.html
  29. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  30. https://apod.nasa.gov/apod/calendar/allyears.html
  31. https://apod.nasa.gov/apod.rss
  32. https://apod.nasa.gov/apod/lib/edlinks.html
  33. https://apod.nasa.gov/apod/lib/about_apod.html
  34. http://asterisk.apod.com/discuss_apod.php?date=211018
  35. https://apod.nasa.gov/apod/ap211019.html
  36. http://www.phy.mtu.edu/faculty/Nemiroff.html
  37. http://www.phy.mtu.edu/
  38. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  39. http://www.astro.umd.edu/
  40. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  41. https://www.nasa.gov/about/highlights/HP_Privacy.html
  42. https://astrophysics.gsfc.nasa.gov/
  43. https://www.nasa.gov/
  44. https://www.nasa.gov/centers/goddard/
  45. http://www.mtu.edu/