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 March 14
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                         Moon Pi and Mountain Shadow
     Image Credit & [3]Copyright: Daniel Lopez ([4]El Cielo de Canarias)

   Explanation: [5]What phase of the Moon is 3.14 radians from the Sun?
   The Full Moon, of course. Even though the [6]Moon might look full for
   several days, the Moon is truly at its full phase when it is [7]Pi
   radians (aka 180 degrees) from the Sun in ecliptic longitude. That's
   opposite the Sun in planet Earth's sky. Rising as the Sun set on March
   9, 2020, only an hour or so after the moment of its full phase, this
   orange tinted and [8]slightly flattened Moon still looked full. It was
   photographed opposite the setting Sun from Teide National Park on the
   Canary Island of Tenerife. Also opposite the setting Sun, seen from
   near the Teide volcano peak about 3,500 meters above sea level, is the
   mountain's rising [9]triangular shadow extending into Earth's dense
   atmosphere. Below the distant ridge line on the left are the white
   telescope domes of [10]Teide Observatory. Again Pi radians from the
   Sun, on March 25 the Full Moon will dim slightly as it glides through
   Earth's outer shadow in a [11]penumbral lunar eclipse.

                     Tomorrow's picture: pixels in space
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    Authors & editors: [23]Robert Nemiroff ([24]MTU) & [25]Jerry Bonnell
                                 ([26]UMCP)
          NASA Official: Amber Straughn [27]Specific rights apply.
               [28]NASA Web Privacy, [29]Accessibility Notices
                A service of: [30]ASD at [31]NASA / [32]GSFC,
                         [33]NASA Science Activation
                           & [34]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2403/MoonriseShadowDLopez_1.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. http://www.elcielodecanarias.com/
   5. https://solarsystem.nasa.gov/news/350/10-ways-to-celebrate-pi-day-with-nasa-on-march-14/
   6. https://earthsky.org/moon-phases/full-moon
   7. https://www.mathsisfun.com/geometry/radians.html
   8. https://apod.nasa.gov/apod/ap161118.html
   9. https://apod.nasa.gov/apod/ap161021.html
  10. https://www.iac.es/en/observatorios-de-canarias/teide-observatory
  11. https://science.nasa.gov/moon/eclipses/
  12. https://apod.nasa.gov/apod/ap240313.html
  13. https://apod.nasa.gov/apod/archivepix.html
  14. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  15. https://apod.nasa.gov/apod/lib/aptree.html
  16. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  17. https://apod.nasa.gov/apod/calendar/allyears.html
  18. https://apod.nasa.gov/apod.rss
  19. https://apod.nasa.gov/apod/lib/edlinks.html
  20. https://apod.nasa.gov/apod/lib/about_apod.html
  21. http://asterisk.apod.com/discuss_apod.php?date=240314
  22. https://apod.nasa.gov/apod/ap240315.html
  23. http://www.phy.mtu.edu/faculty/Nemiroff.html
  24. http://www.phy.mtu.edu/
  25. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  26. http://www.astro.umd.edu/
  27. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  28. https://www.nasa.gov/about/highlights/HP_Privacy.html
  29. https://www.nasa.gov/general/accessibility/
  30. https://astrophysics.gsfc.nasa.gov/
  31. https://www.nasa.gov/
  32. https://www.nasa.gov/centers/goddard/
  33. https://science.nasa.gov/learners
  34. http://www.mtu.edu/