Matthew's Journal

Last night we were treated to a very lovely sunset over the ocean. Additionally, opposite the sunset we saw a spectacular display of anti-crepuscular rays. Anti-Crepuscular rays appear to converge on the anti-solar point of the sun. That is the point in the sky directly opposite the sun. Anti-Crepuscular Rays, like crepuscular rays, require clouds to cast shadows in order to generate the effect.

You can read about this and other atmospheric optical phenomena at http://www.atoptics.co.uk/.

Anti-Crepuscular Rays
Photo Credit: Alan Brewer - NOAA ESRL