APOD
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
The Glory
Explanation: Looking out the window of an airplane, you might be lucky enough to see “the glory” in the direction directly opposite the Sun. Before airplanes , the phenomenon, known to some as the heiligenschein or the Specter of the Brocken , was sometimes seen from mountaintops. There, when conditions were right, one could look away from the Sun and see what appeared to be the shadow of a giant surrounded by a bright halo . The giant turns out to be the observer, as in the modern version a silhouette of an plane frequently occupies the glory's center. Pictured above , several concentric rings of the glory were photographed. The cause of the glory has only been understood recently and is relatively complex. Briefly , small droplets of water reflect , refract , and diffract sunlight backwards towards the Sun . The phenomenon has similar counterparts in other branches of science including astronomy , where the looking out from the Earth in the direction opposite the Sun yields a bright spot called the gegenschein .
| Date | April 17, 2002 |
|---|---|
| Credit | Credit & Copyright: James B. Kaler ( UIUC ), Skylights |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |



