Watch Livestream: Solar eclipse begins over U.S.

Millions of people began gathering in the U.S. on Monday along a narrow stretch from Mexico to the U.S. to Canada for a glimpse of a total eclipse of the sun. 

The eclipse, depending upon where one is watching and the weather, should bring at least about four minutes of darkness.

Ideal conditions have been hampered by forecasts for clouds. 

The phenomenon got underway in the Pacific shortly before noon ET, according to The Associated Press.