Subj : Daily APOD Report To : All From : Ben Ritchey Date : Tue Feb 12 2019 10:08:22 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 February 12 [2] Plane Crossing a Crescent Moon Image Credit & Copyright: Olivier Staiger (Binounistan.com [3] ) Explanation: No, this is not a good way to get to the Moon [4] . [5] What is pictured is a chance superposition of an airplane and the Moon. The contrail [6] would normally appear white, but the large volume of air toward the setting Sun preferentially knocks away blue light [7] , giving the reflected trail [8] a bright red hue. Far in the distance, well behind the plane, is a crescent Moon [9] , also slightly reddened. Captured a month ago above Valais [10] , Switzerland [11] , the featured image was taken so soon after sunset that planes in the sky were still in sunlight, as were their contrails [12] . Within minutes, unfortunately, the impromptu sky show ended. The plane crossed the Moon [13] and moved out of sight. The Moon set [14] . The contrail became unilluminated and then dispersed. Tomorrow's picture: old blue eye ------------------------------------------------------------------------------- < [15] | Archive [16] | Submissions [17] | Index [18] | Search [19] | Calendar [20] | RSS [21] | Education [22] | About APOD [23] | Discuss [24] | > [25] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [26] (MTU [27] ) & Jerry Bonnell [28] (UMCP [29] ) NASA Official: Phillip Newman Specific rights apply [30] . NASA Web Privacy Policy and Important Notices [31] A service of: ASD [32] at NASA [33] / GSFC [34] & Michigan Tech. U. [35] ---------- Site notes: [1] archivepix.html [2] image/1902/PlaneTrailMoon_Staiger_1555.jpg [3] http://www.bibounistan.com/ [4] https://www.youtube.com/watch?v=mQR0bXO_yI8 [5] https://en.wikipedia.org/wiki/Fly_Me_to_the_Moon#NASA_association [6] ap041013.html [7] http://math.ucr.edu/home/baez/physics/General/BlueSky/blue_sky.html [8] https://en.wikipedia.org/wiki/Contrail [9] https://spaceplace.nasa.gov/review/dr-marc-earth/moon-phases.html [10] https://www.youtube.com/watch?v=YgeFld1l_BQ [11] https://en.wikipedia.org/wiki/Switzerland [12] https://science-edu.larc.nasa.gov/contrail-edu/science.html [13] ap180912.html [14] ap180604.html [15] ap190211.html [16] archivepix.html [17] lib/apsubmit2015.html [18] lib/aptree.html [19] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search [20] calendar/allyears.html [21] /apod.rss [22] lib/edlinks.html [23] lib/about_apod.html [24] http://asterisk.apod.com/discuss_apod.php?date=190212 [25] ap190213.html [26] http://www.phy.mtu.edu/faculty/Nemiroff.html [27] http://www.phy.mtu.edu/ [28] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html [29] http://www.astro.umd.edu/ [30] lib/about_apod.html#srapply [31] https://www.nasa.gov/about/highlights/HP_Privacy.html [32] https://astrophysics.gsfc.nasa.gov/ [33] https://www.nasa.gov/ [34] https://www.nasa.gov/centers/goddard/ [35] http://www.mtu.edu/ --- Mystic BBS v1.12 A43 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .