Explanation: Have you ever seen a halo around the Moon? This fairly common sight occurs when high thin clouds containing millions of tiny ice crystals cover much of the sky. Each ice crystal acts like a miniature lens. Because most of the crystals have a similar elongated hexagonal shape, light entering one crystal face and exiting through the opposing face refracts 22 degrees, which corresponds to the radius of the Moon Halo. A similar Sun Halo may be visible during the day. Exactly how ice-crystals form in clouds remains a topic of research. In the featured image taken last week from cstersund, Sweden, a complete lunar halo was captured over snowy trees and rabbit tracks.

APOD is available via Instagram: in English, Indonesian, Persian, and Portuguese

<<  Fevral'  >> Pn Vt Sr Cht Pt Sb Vs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 1995   1996   1997 1998   1999   2000 2001   2002   2003 2004   2005   2006 2007   2008   2009 2010   2011   2012 2013   2014   2015 2016   2017   2018 2019   2020   2021 2022   2023   2024

Yanvar' Fevral' Mart Aprel' Mai Iyun' Iyul' Avgust Sentyabr' Oktyabr' Noyabr' Dekabr'

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: halo - galo - atmosfernye yavleniya Publikacii so slovami: halo - galo - atmosfernye yavleniya
Sm. takzhe: STIV: siyayushaya reka nad Franciei Oreol i tumannaya duga Stolby sveta nad Vnutrennei Mongoliei Yuvyaskulya na nebe Snezhnaya burya 1938 goda v Verhnem Michigane Okruzhaya Solnce Ledyanye galo nad Bavariei Vse publikacii na tu zhe temu >>