PORTLAND, Ore. (KOIN) — For the first time in 99 years, a total solar eclipse will glide across the entire United States, slicing across the continent from Oregon to South Carolina.

NASA has prepared for this solar eclipse for years.

Programming began at 9 a.m. PT with a preview show hosted from Charleston, South Carolina. The main show began at 10 a.m. PT and covered the path of totality the eclipse will take across the United States, from Oregon to South Carolina.

The program featured views from NASA research aircraft, high-altitude balloons, satellites and specially-modified telescopes. It also will include live reports from Charleston, as well as from Salem, Oregon; Idaho Falls, Idaho; Beatrice, Nebraska; Jefferson City, Missouri; Carbondale, Illinois; Hopkinsville, Kentucky; and Clarksville, Tennessee.On Ustream:  (App users — click here)On YouTube: (App users — click here)