The Sun, it goes without saying, is a very bright object.
During the eclipse, its not so bright, as the Moon slowly moves across its face.
Alternatives, such as regular sunglasses or welders masks, arent good enough.
NASA employees and visitors enjoying the total solar eclipse on August 21, 2017.Photo: NASA/Connie Moore
To ensure safety, glasses must meet theISO 12312-2 standard, visibly marked on the glasses themselves.
The first step is to purchase the units directly from a reputable, vetted vendor.
The list also includes approved manufacturers, includingAmerican Paper OpticsandHalo Eclipse Spectacles.
This is what you want to see on your eclipse glasses or hand-held viewer.Photo: George Dvorsky
Also, check to check that the ISO 12312-2 standard appears directly on the unit.
Assuming everything looks good, put them on while indoors and have a look around.
You should see absolutely nothing, except for bright lights, which should appear faint.
The next step is to go outside and look around.
Again, you shouldnt see anything except, perhaps, the reflection of the Sun off a window.
Take a look at the Sun, but only for one second.
The filtered view should show a perfect circle, resembling the Moon in shape and size.
Do not use…if damaged, torn, punctured or separated from the frame in any way.
Do not use with other optical devices.
This is not a toy.
Children should only use with adult supervision.
Limited to 3 minutes continuous use, intermittently for several hours.
When using this product do not move around, drive a motor vehicle, or operate machinery.
Do not use with diseased eye or after eye surgery.
Again, smart advice.
The common thread is that you should gaze at the Sun sparingly, and dont overdo it.
So enjoy, and heres hoping for clear skies!
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