(Claritza Jimenez, Daron Taylor, Angela Fritz/The Washington Post)
Up next in Weather
promo
0:28
Watch a time-lapse of the solar eclipse in D.C.
September 1, 2017
promo
1:16
Watch animals reenact the solar eclipse
August 22, 2017
promo
2:04
'Eclipse hypochondria,' according to the Internet
August 22, 2017
promo
1:05
How to make a pinhole projector to view the solar eclipse
August 20, 2017
Weather

How do scientists know when and where an eclipse will happen?

August 4, 2017 | 3:39 PM GMT
Capital Weather Gang’s Angela Fritz explains how math is used to determine the timing and location of an eclipse, such as the one that crossed the U.S. on Aug. 21.