Those looking at the eclipse within the path of totality - where the moon will completely block the sun along a path spanning from OR to SC - can view the eclipse without protection during the two minutes OR so that the sun is completely out of view. Viewers within the path of totality-a thin, 70-mile-wide swath-will see the moon completely eclipse the sun.
This rare alignment, in which only the sun's corona is visible, hasn't been seen across the continental U.S. since 1918, and a record number of people are flocking to states where they can see totality. A total solar eclipse happens when the Moon blocks out the Sun's rays entirely and forms a halo of light around the Moon, called a corona. What is an eclipse?
For more information on their opportunities and what they expect to see, visit NASA's Solar Eclipse website. Even away from totality, the eclipse can make our old, familiar world seem otherworldly. The eclipse enters the USA from Lincoln City, Oregon, at 9.05am (EST) as a partial solar eclipse, becoming a total eclipse at 10.16am (EST), and will leave United States shores at at 2.44pm (EST) near Columbia, South Carolina.
Steve Russell/Toronto Star via Getty ImagesA steaming pot shows the partial solar eclipse in its shadows in Toronto on August 21, 2017.
If you have absolutely no choice but to miss the eclipse or if weather is uncooperative where you are, don't fret too badly. The rays can be damaging to the eyes, and you will not want to look up at the sun while the eclipse is happening.
You don't actually need special glasses to view the eclipse, you just need them to look directly at the sun. In Greenville, the moon began covering the sun shortly after 1 p.m. and reached its moment of complete obscuration for about two minutes at 2:38 p.m.
12 p.m. EDT - Eclipse Preview Show, hosted from Charleston, South Carolina. Use only approved devices (eclipse glasses, pinhole camera, etc.) for viewing the eclipse. "The safest and most low-priced method of viewing an eclipse is by projection, in which a pinhole or small opening is used to cast the image of the sun on a screen placed a half-meter or more beyond the opening", NASA says, according to the Atlanta Journal Constitution.
The phases of a partial eclipse are not as exciting as a total eclipse.
As for the next eclipse to travel over North America, we will have to wait until 2024!