 |
|
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
|
|
seeing
The blurring of a stellar (point-like) image due to turbulence in Earth's atmosphere. Seeing estimates are often given in terms of the full-width in arcseconds of the image at the points where the intensity has fallen to half its peak value. The typical value at a good site is a little better than 1". Amateur astronomers often used the five-point Anontiadi scale, which rates seeing as I (perfect), II (good), III (moderate), IV (poor), and V (very bad).
Related categories
• OBSERVATIONAL ASTRONOMY
• OPTICS AND OPTICAL PHENOMENA
Also on this site:
Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History
Transport Concepts & Designs (partner site)