According to the NASA website, "the only safe way to look directly at the uneclipsed or partially eclipsed sun is through special-purpose solar filters such as "eclipse glasses" or hand-held solar viewers".
Some are saying it will be the most-watched show in the US and although Southwest Florida residents will not be able to see the full eclipse, viewers can still suffer from irreversible eye damage, said Doctor Jonathan Frantz, owner of Frantz Eye care in Lee County.
The total eclipse will be visible nearby in parts of Missouri (see the full map), but even in Fayetteville, a 90% eclipse will be visible on the 21st.
"For those who are planning on watching this incredible event, make sure you are well prepared with the proper eye protection", Weng said.
So in short, you'll want to be wary of knockoff glasses, the AAS said.
Aside from the Library's event, the Helena Astronomical Society will also offer safety tips at the next two farmer's markets.
While the eclipse will only reach 85 percent of southern Wisconsin, the risk of vision loss still exists if protective eyewear is not used.
In news that surprises no one, demand for eclipse glasses has spiked, given the attention of the upcoming Great American Eclipse set for August 21, which will run across the continental United States.
The February 1979 eclipse passed over most of Montana.
A quick way to see the action without looking at the sky at all is to stand in the shade of a tree, then cross one's fingers across each other to form a waffle pattern.
The Sunspotter is a curved device that focuses light and shadow from the eclipse onto paper. Take note, though - eclipse glasses aren't just sunglasses. Schmude recommends children use them only under the supervision of an adult.
"It's easy to understand the motion of the moon, earth and sun", Schmude said.
Two parts of the moon's shadow, the umbra and penumbra, will cross the USA from OR to SC on August 21.