2017 Great American Total Solar Eclipse
- Posted on: Aug 1 2017
What is the eclipse expected to show?
The bright face of the sun is covered gradually by the moon during a partial eclipse, lasting a few hours. During the brief period of a total eclipse when the moon fully covers the sun (only a couple of minutes), the light of day gives way to a deep twilight sky. The sun’s outer atmosphere (called the solar corona) gradually appears, glowing like a halo around the moon in front of it.
Bright stars and planets become more visible in the sky.
There is only one safe way to look directly at the sun, whether during an eclipse or not: through special-purpose solar filters. These solar filters are used in “eclipse glasses” or in hand-held solar viewers.
They must meet a very specific worldwide standard known as ISO 12312-2.
Remember: ordinary sunglasses, even very dark ones, or
homemade filters are not safe for looking at the sun.
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