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.

                                 2022 May 19
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                           A Digital Lunar Eclipse
                Image Credit & [3]Copyright: [4]Michael Cain

   Explanation: Recorded on May 15/16 this sequence of exposures follows
   the Full Moon during a total lunar eclipse as it arcs above treetops in
   the clearing skies of central Florida. A frame taken every 5 minutes by
   a digital camera shows the progression of the eclipse over three hours.
   The bright lunar disk grows dark and red as it [5]glides through planet
   Earth's shadow. In fact, counting the central frames in the sequence
   measures the roughly 90 minute duration of the total phase of this
   eclipse. Around 270 BC, the Greek astronomer [6]Aristarchus also
   measured the duration of total lunar eclipses, but probably [7]without
   the benefit of digital watches and cameras. Still, [8]using geometry he
   devised a simple and impressively accurate way to calculate the Moon's
   distance in terms of the radius of [9]planet Earth, from the eclipse
   duration.

               Tomorrow's picture: a view from Earth's shadow
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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/2205/TLE_2022-05-16-02-59-35s.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.coldlifephotography.com/
   5. https://moon.nasa.gov/news/172/what-you-need-to-know-about-the-lunar-eclipse/
   6. http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Aristarchus.html
   7. https://www.goodreads.com/quotes/54481-far-out-in-the-uncharted-backwaters-of-the-unfashionable-end
   8. http://www.phy6.org/stargaze/Shipprc2.htm
   9. http://science.nasa.gov/earth-science/
  10. https://apod.nasa.gov/apod/ap220518.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=220519
  20. https://apod.nasa.gov/apod/ap220520.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/