A halo around the moon

A Halo Around the Moon 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. The setting of the below picture is Athens, Greece. The distant planet Jupiter appears by chance on the halo’s left. Exactly how ice-crystals form in clouds remains under investigation.
Image & info via APOD

Image Credit & Copyright: Anthony Ayiomamitis (TWAN)
Moon halo – read & learn:

http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/opt/ice/halo/22.rxml
 #naturalphenomena   #moonhalo   #space  

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s