Subj : Daily APOD Report To : All From : Ben Ritchey Date : Thu May 16 2019 10:18:16 Astronomy Picture of the Day Astronomy Picture of the Day Discover the cosmos! [1] Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2019 May 16 [2] Dark Skies: Turn on the Night Image Credit & Copyright: Jeff Dai [3] (TWAN [4] ) Explanation: Have you ever experienced a really dark night sky? One common and amazing feature is the glowing band of our Milky Way galaxy stretching [5] from horizon to horizon. If you live in or near a big city, though, you might not know this because city lights [6] reflecting off the Earth's atmosphere [7] could only allow you to see [8] the Moon and a few stars. Today, however, being UNESCO [9] 's International Day of Light [10] , the International Astronomical Union [11] is asking people to Turn on the Night [12] by trying to better understand, and in the future better reduce, light pollution [13] . You can practice even now by going to the main APOD website at NASA [14] and hovering your cursor over the Before image [15] . The After [16] picture that comes up is a panorama of four exposures taken with the same camera and from the same location, showing what happened recently [17] in China [18] when people in Kaihua County [19] decided to turn down many of their lights. Visible in the Before picture [20] are the stars Sirius (left of center) and Betelgeuse, while visible in the After picture [21] are thousands of stars with the arching band of our Milky Way Galaxy. Humanity has lived for millennia under a dark night sky [22] , and connecting to it has importance [23] for both natural and cultural heritage. Tomorrow's picture: distant reflections ------------------------------------------------------------------------------- < [24] | Archive [25] | Submissions [26] | Index [27] | Search [28] | Calendar [29] | RSS [30] | Education [31] | About APOD [32] | Discuss [33] | > [34] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [35] (MTU [36] ) & Jerry Bonnell [37] (UMCP [38] ) NASA Official: Phillip Newman Specific rights apply [39] . NASA Web Privacy Policy and Important Notices [40] A service of: ASD [41] at NASA [42] / GSFC [43] & Michigan Tech. U. [44] ---------- Site notes: [1] archivepix.html [2] image/1905/TotnAfter_Dai_3000.jpg [3] http://www.twanight.org/Dai [4] http://www.twanight.org/ [5] ap070508.html [6] ap160630.html [7] https://www.nasa.gov/sites/default/files/images/ 662995main_upper-atmosphere-MOS_full.jpg [8] https://petapixel.com/2017/02/09/ light-pollution-changes-view-orion-constellation/ [9] https://en.unesco.org/about-us/introducing-unesco [10] https://www.lightday.org/events [11] https://www.iau.org/administration/about/ [12] https://mailchi.mp/laserclassroom.com/turnonthenight [13] https://en.wikipedia.org/wiki/Light_pollution#Effect_on_astronomy [14] http://apod.nasa.gov/ [15] image/1905/TotnBefore_Dai_3000.jpg [16] image/1905/TotnAfter_Dai_3000.jpg [17] http://www.twanight.org/newTWAN/news.asp?newsID=6111 [18] https://en.wikipedia.org/wiki/China [19] https://en.wikipedia.org/wiki/Kaihua_County [20] image/1905/TotnBefore_Dai_3000.jpg [21] image/1905/TotnAfter_Dai_3000.jpg [22] https://www.iau-100.org/dark-skies-for-all [23] https://www.globeatnight.org/ [24] ap190515.html [25] archivepix.html [26] lib/apsubmit2015.html [27] lib/aptree.html [28] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search [29] calendar/allyears.html [30] /apod.rss [31] lib/edlinks.html [32] lib/about_apod.html [33] http://asterisk.apod.com/discuss_apod.php?date=190516 [34] ap190517.html [35] http://www.phy.mtu.edu/faculty/Nemiroff.html [36] http://www.phy.mtu.edu/ [37] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html [38] http://www.astro.umd.edu/ [39] lib/about_apod.html#srapply [40] https://www.nasa.gov/about/highlights/HP_Privacy.html [41] https://astrophysics.gsfc.nasa.gov/ [42] https://www.nasa.gov/ [43] https://www.nasa.gov/centers/goddard/ [44] http://www.mtu.edu/ --- Mystic BBS v1.12 A43 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .