FIRST CONTACT: The instance when the partial phase of an eclipse begins.
UMBRA: The innermost and darkest part of the moon’s shadow totality.
TOTALITY: The duration of total obscuration of the sun during the eclipse. ( The only time you can take your glasses off. )
Totality begins near Lincoln City, Or. at 1:15pm Monday ET. The moon’s shadow will take 93 minutes to travel across the country at an average speed of 1,850 mph. Totality ends at 2:48 pm ET near Charleston, SC.
Information taken from The Weather Channel AMHQ.