Hospitals regularly see patients who have damaged their eyes while watching eclipses.
More than 1,300 tickets were sold to the event, and those tickets sold out in about five minutes.
The Parks Service said the event fits in with their goals as an organization.
The long-awaited eclipse will hit the United States, cutting a 70-mile-wide path of complete darkness across the country from OR to SC for two minutes today.
Eclipses occur when one heavenly body moves into the shadow of another heavenly body. A partial eclipse can be seen over a much wider area.
It's the first total solar eclipse that sweeps coast-to-coast across the country in 99 years. That only happens in the 70 mile wide path of totality, which stretches from OR to SC, only clipping extreme western North Carolina.
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The movement of the moon between the Earth and sun will produce a much more dramatic event in the USA, where a total eclipse will turn day to night for two minutes.
NBC News has a livestream of the solar eclipse on YouTube. In other parts of the world, the next total solar eclipse will be visible in Chile and Argentina on July 2, 2019.
In Oregon, the first location in the country to witness totality, clear skies should set the mood for eclipse.
While eclipse glasses filter out light, the pinhole camera instead projects the light from the sun onto another surface, so you're looking at projection instead of directly at the sun. Sunglasses are not enough protection for your eyes so look for the ISO 12312-2 statement on the side of your glasses, to be sure that you have enough protection for your eyes.