On Aug. 21 millions of people will look skyward as day turns into night when the first coast-to-coast solar eclipse in almost a century passes over Middle Tennessee.
This will be the first total eclipse visible from the United States mainland since 1979.
Youth Services library assistant Andy Miller looks up at overhead lights while wearing solar eclipse viewing glasses at the Bettendorf Public Library.
"I have seen instances where the patient has eventually shown up with crescents burned into the back of the eye, and you can nearly tell exactly when they looked", Ralph Chou, professor emeritus at the School of Optometry and Vision Science at the University of Waterloo in Canada, told space.com.
That's when Johann Julius Friedrich Berkowski took the first photograph of a total solar eclipse.
And luckily, Best Buy has yet to run out of solar eclipse glasses that are advised to properly see the eclipse safely. According to the National Weather Service in Sioux Falls, the partial eclipse will appear like twilight occurring in the middle of the day.More news: Tata Steel agrees deal to restructure UK pension fund
Do I really need to use special glasses, is the sun really going to damage my eyes?
So what will the sun look like your proper glasses? The next full solar eclipse, which will be viewable in some parts of North America will occur in 2024. The partial solar eclipse (weather permitting) will be at 2:13 p.m.
Or you can watch via an alternative indirect method, such as with a pinhole viewer that you can easily make at home. The eclipse will move from the West Coast to the East Coast, ending near Columbia, South Carolina, at 2:44 p.m. While the scientific aspects of an eclipse are fascinating, McGowan also says one is not required to be interested in any of that to appreciate the astrological anomaly. If you glance at the sun through your glasses, for example, and find it uncomfortably bright, out of focus and surrounded by a murky haze, they're no good.
In each place where the total solar eclipse will be experienced, it will last no longer than two minutes and 40 seconds. Here on the Keweenaw Peninsula, we will have a 71 percent eclipse.
Scientists and amateur astronomers have been using NASA data to plan their eclipse trips for years. It's called solar retinopathy, and it's like a sunburn on your retina, and causes spots in your vision that may or may not go away.