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 October 1 [2]See Explanation. Clicking on the picture will download the highest resolution version available. Lunation Matrix Image Credit & [3]Copyright: [4]Tunc Tezel ([5]TWAN) Explanation: [6]Observe the Moon every night and you'll see its visible sunlit portion gradually change. [7]In phases progressing from New Moon to Full Moon to New Moon again, a lunar cycle or lunation is completed in about 29.5 days. Top left to bottom right, this 7x4 matrix of telescopic images captures the range of lunar phases for 28 consecutive nights, from the evening of July 29 to the morning of August 26, following an [8]almost complete lunation. No image was taken 24 hours or so just after and just before [9]New Moon, when the lunar phase is at best a narrow crescent, close to the Sun and [10]really hard to see. Finding mostly clear Mediterranean skies required an occasional road trip to complete this lunar cycle project, imaging in early evening for the first half and late evening and early morning for the second half of the lunation. Since all the images are registered at the same scale you can use this matrix to track the change in the Moon's apparent size during the single lunation. For extra credit, find the lunar phase that occurred [11]closest to perigee. Tonight: [12]International Observe the Moon Night Tomorrow's picture: cosmic cannon __________________________________________________________________ [13]< | [14]Archive | [15]Submissions | [16]Index | [17]Search | [18]Calendar | [19]RSS | [20]Education | [21]About APOD | [22]Discuss | [23]> __________________________________________________________________ Authors & editors: [24]Robert Nemiroff ([25]MTU) & [26]Jerry Bonnell ([27]UMCP) NASA Official: Phillip Newman [28]Specific rights apply. [29]NASA Web Privacy Policy and Important 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/2210/Lu20220729-0826.jpg 3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 4. http://www.twanight.org/tezel 5. http://www.twanight.org/ 6. https://moon.nasa.gov/observe-the-moon-night/ 7. https://svs.gsfc.nasa.gov/4955 8. https://vimeo.com/744501648 9. http://www.astrophoto.fr/new_moon_2013july8.html 10. https://apod.nasa.gov/apod/ap220725.html 11. https://apod.nasa.gov/apod/ap220616.html 12. https://moon.nasa.gov/observe-the-moon-night/ 13. https://apod.nasa.gov/apod/ap220930.html 14. https://apod.nasa.gov/apod/archivepix.html 15. https://apod.nasa.gov/apod/lib/apsubmit2015.html 16. https://apod.nasa.gov/apod/lib/aptree.html 17. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 18. https://apod.nasa.gov/apod/calendar/allyears.html 19. https://apod.nasa.gov/apod.rss 20. https://apod.nasa.gov/apod/lib/edlinks.html 21. https://apod.nasa.gov/apod/lib/about_apod.html 22. http://asterisk.apod.com/discuss_apod.php?date=221001 23. https://apod.nasa.gov/apod/ap221002.html 24. http://www.phy.mtu.edu/faculty/Nemiroff.html 25. http://www.phy.mtu.edu/ 26. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 27. http://www.astro.umd.edu/ 28. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 29. https://www.nasa.gov/about/highlights/HP_Privacy.html 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/