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 July 11 [2]See Explanation. Moving the cursor over the image will bring up an annotated version. Clicking on the image will bring up the highest resolution version available. Find the Moon Image Credit & Copyright: [3]Jimmy Westlake ([4]Colorado Mountain College) Explanation: Where's the Moon? Somewhere in this image, the Earth's Moon is hiding. The [5]entire Moon is visible, in its completely full phase, in plain sight. Even the photographer's keen eye couldn't find it even though he knew exactly where to look -- only the [6]long exposure of his camera picked it up -- barely. Although by now you might be [7]congratulating yourself on finding it, why was it so difficult to see? For one reason, this photograph was taken during a [8]total lunar eclipse, when the Earth's [9]shadow made [10]the Moon much dimmer than a normal full Moon. For another, the image, taken in [11]Colorado, [12]USA, was captured just before sunrise. With [13]the Moon on the exact opposite side of the sky from the Sun, this meant that the Sun was just below the horizon, but still [14]slightly illuminating the sky. Last, as the [15]Moon was only about two degrees above the horizon, the [16]large volume of air between the camera and the horizon scattered a lot of light away from the [17]background Moon. Twelve minutes after this image was acquired in 2012, [18]the Sun peeked over the horizon and the Moon set. Tomorrow's picture: comet, planet, or star? __________________________________________________________________ [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: Phillip Newman [34]Specific rights apply. [35]NASA Web Privacy Policy and Important Notices A service of: [36]ASD at [37]NASA / [38]GSFC & [39]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2107/spotthemoon_westlake_2128.jpg 3. http://www.jwestlake.com/ 4. http://faculty.coloradomtn.edu/jwestlake/ 5. https://apod.nasa.gov/apod/ap210222.html 6. https://apod.nasa.gov/apod/ap110717.html 7. https://static.onecms.io/wp-content/uploads/sites/20/2021/01/25/cat-birthday.jpg 8. https://apod.nasa.gov/apod/ap111214.html 9. https://apod.nasa.gov/apod/ap111215.html 10. https://solarsystem.nasa.gov/moons/earths-moon/overview/ 11. https://en.wikipedia.org/wiki/Colorado 12. https://en.wikipedia.org/wiki/U.S._state 13. https://apod.nasa.gov/apod/ap171203.html 14. https://en.wikipedia.org/wiki/Twilight 15. https://apod.nasa.gov/apod/ap180624.html 16. https://en.wikipedia.org/wiki/Air_mass_(astronomy) 17. https://apod.nasa.gov/apod/ap200322.html 18. https://solarsystem.nasa.gov/solar-system/sun/overview/ 19. https://apod.nasa.gov/apod/ap210710.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.nasa.gov/apod.rss 26. https://apod.nasa.gov/apod/lib/edlinks.html 27. https://apod.nasa.gov/apod/lib/about_apod.html 28. http://asterisk.apod.com/discuss_apod.php?date=210711 29. https://apod.nasa.gov/apod/ap210712.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://astrophysics.gsfc.nasa.gov/ 37. https://www.nasa.gov/ 38. https://www.nasa.gov/centers/goddard/ 39. http://www.mtu.edu/