solar eclipse in India and Photos,Pictures, Safe Viewing Methods|surya grahan 2009

surya grahan 2009

The solar eclipse of Wednesday, July 22, 2009 will be the longest total solar eclipse of the 21st century, lasting at most 6 minutes, 39 seconds.

 

Safe Viewing Methods
There are only three safe viewing methods:

1. Viewing through a special aluminized Mylar film designed specifically for eclipse viewing. (The Mylar may be made into very inexpensive paper-framed viewers or glasses and sold cheaply, or distributed free.)

2. Viewing through very dark welder's glass

3. Viewing by projection: you use a card with a small hole in it to project an image of the eclipse on a screen, and you watch the screen, not the sun. You can use a piece of paper, or even a straw hat with a little hole in it. Just put something with a little hole in it over a flat surface and you'll see the sun's movement.

Unsafe Viewing Methods
These viewing methods, some hallowed by folk tradition or flawed logic, are unsafe, and you will damage your eyes by using them:

1. Sunglasses, single or multiple layers
2. Smoked glass
3. All color film, black-and-white film that contains no silver, photographic negatives with images on them (x-rays and snapshots)
4. Polarizing filters
5. Photographic neutral density filters
6. Mylar film not of optical grade (such as product packaging)