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.

                              2020 September 26
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                      Moon Pairs and the Synodic Month
            Image Credit & [3]Copyright: [4]Marcella Giulia Pace

   Explanation: [5]Observe the Moon each night and its visible sunlit
   portion will gradually change. [6]In phases progressing from New Moon
   to Full Moon to New Moon again, a lunar cycle or [7]synodic month is
   completed in about 29.5 days. They look full, but top left to bottom
   right these panels do show the range of lunar phases for a complete
   [8]synodic month during August 2019 from Ragusa, Sicily, Italy, planet
   Earth. For this lunar cycle project the panels organize images of the
   lunar phases in pairs. Each individual image is paired with another
   image separated by about 15 days, or approximately half a synodic
   month. As a result the opposite sunlit portions complete the lunar disk
   and the shadow line at the boundary of lunar night and day, the
   terminator, steadily marches across the Moon's [9]familiar nearside.
   For extra credit, what lunar phase would you pair with the Moon
   tonight?

                      Tomorrow's picture: cloudy skies
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    Authors & editors: [21]Robert Nemiroff ([22]MTU) & [23]Jerry Bonnell
                                 ([24]UMCP)
          NASA Official: Phillip Newman [25]Specific rights apply.
              [26]NASA Web Privacy Policy and Important Notices
                A service of: [27]ASD at [28]NASA / [29]GSFC
                           & [30]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2009/PairsMoonPace.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://greenflash.photo/about-me/
   5. https://moon.nasa.gov/observe-the-moon-night/about/overview/
   6. https://svs.gsfc.nasa.gov/Gallery/moonphase.html
   7. http://astropixels.com/ephemeris/moon/synodicmonth2001.html
   8. https://greenflash.photo/portfolio/august-2019-all-moon-phases-in-a-month/
   9. http://lroc.sese.asu.edu/posts/293
  10. https://apod.nasa.gov/apod/ap200925.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=200926
  20. https://apod.nasa.gov/apod/ap200927.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. http://www.mtu.edu/