NASA reminds you:
Eye Safety During an Eclipse
Observing our star, the Sun, can be safe and inspirational.
Except for a specific and brief period of time during a total solar eclipse, you must never look directly at the Sun without proper eye protection, such as safe solar viewing glasses (eclipse glasses). Eclipse glasses are NOT the same as regular sunglasses; regular sunglasses are not safe for viewing the Sun. During a total solar eclipse, you must wear your eclipse glasses (or use other solar filters) to view the Sun directly during the partial eclipse phase. You can only take your glasses off during the short time when the Moon completely obscures the Sun – known as the period of totality. If you don’t have eclipse glasses, you can use an indirect viewing method, such as a pinhole projector, which projects an image of the Sun onto a nearby surface.
(Source: NASA)
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