This March 9, 2016, file photo shows a total solar eclipse in Belitung, Indonesia. The total solar eclipse on Aug. 21, 2017 will be the first in the mainland U.S. in almost four decades.
This March 9, 2016, file photo shows a total solar eclipse in Belitung, Indonesia. The total solar eclipse on Aug. 21, 2017 will be the first in the mainland U.S. in almost four decades. The Associated Press
This March 9, 2016, file photo shows a total solar eclipse in Belitung, Indonesia. The total solar eclipse on Aug. 21, 2017 will be the first in the mainland U.S. in almost four decades. The Associated Press