The US will get to see a solar eclipse on August 21. 

While the entire country will get to witness at least a partial eclipse, the lucky people who live along or travel to the 140km-wide streak of totality will see the moon completely block out the sun’s light as it crosses between the Earth and the sun. 

For those who will be able to watch the total solar eclipse in person, there’s plenty to see up in the sky. (Those who can’t can watch it on NASA’s Facebook page, live.)

But there are also some unexpected phenomena that happen on the ground during the eclipse. 

Here are some of the things to keep an eye out for. 

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