Anticrepuscular Rays Over Colorado - William Blake (Birthday), Helen Keller, George Washington, & Heinrich Heine
“If the doors of perception were cleansed everything would appear to man as it is, infinite.
A fool sees not the same tree that a wise man sees.
To see a World in a Grain of Sand
And a Heaven in a Wild Flower,
Hold Infinity in the palm of your hand
And Eternity in an hour.”
- William Blake (Born November 28, 1757)
“Arbitrary power is most easily established on the ruins of liberty abused to licentiousness.”
- George Washington
“Although the world is full of suffering, it is full also of the overcoming of it. My optimism, then, does not rest on the absence of evil, but on a glad belief in the preponderance of good and a willing effort always to cooperate with the good, that it may prevail.
Security is mostly a superstition… Life is either a daring adventure, or nothing.”
- Helen Keller
“Where they burn books, sooner or later they will also burn people.”
- Heinrich Heine
Anticrepuscular Rays Over Colorado
Credit & Copyright: John Britton
Read more at apod.nasa.gov
Explanation: What’s happening over the horizon? Although the scene may appear somehow supernatural, nothing more unusual is occurring than a setting Sun and some well placed clouds. Pictured above are anticrepuscular rays. To understand them, start by picturing common crepuscular rays that are seen any time that sunlight pours though scattered clouds. Now although sunlight indeed travels along straight lines, the projections of these lines onto the spherical sky are great circles. Therefore, the crepuscular rays from a setting (or rising) sun will appear to re-converge on the other side of the sky. At the anti-solar point 180 degrees around from the Sun, they are referred to as anticrepuscular rays. Pictured above is a particularly striking set of anticrepuscular rays photographed in 2001 from a moving car just outside of Boulder, Colorado, USA.