Slideshow: Moon starts its path in front of the sun as millions gather to witness total solar eclipse
The moon partially covers the sun during a total solar eclipse, as seen from Eagle Pass, Texas, Monday, April 8, 2024. (AP Photo/Eric Gay)
Yurem Rodriquez watches as the moon partially covers the sun during a total solar eclipse, as seen from Eagle Pass, Texas, Monday, April 8, 2024. (AP Photo/Eric Gay)
The moon covers the sun during a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
The moon partially covers the sun during a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
The moon partially covers the sun during a total solar eclipse, as seen from Eagle Pass, Texas, Monday, April 8, 2024. (AP Photo/Eric Gay)
People use special glasses to watch a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
The beginning of a solar eclipse, as seen from Fort Worth, Texas, Monday, April 8, 2024. (AP Photo/LM Otero)
Sun spots are seen during the beginning phase of a total solar eclipse, Monday, April 8, 2024, in Arlington, Texas. (AP Photo/Julio Cortez)
The moon partially covers the sun during a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
People use special glasses to watch a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
People gather under overcast skies in anticipation of watching the total solar eclipse from Niagara Falls, Ontario, Monday, April 8, 2024. (AP Photo/Matt Rourke)
A research balloon is prepared for launch at the Indianapolis Motor Speedway in Indianapolis, Monday, April 8, 2024 to study the total eclipse. NearSpace Education launched two high-altitude research balloons carrying cameras, instruments, and experiments designed by blind and visually impaired students. (AP Photo/Michael Conroy)
Kenny Riehl, of Solon, Iowa, adjusts a telescope while looking at the sun before a total solar eclipse, Monday, April 8, 2024, in Trenton, Ohio. (AP Photo/Joshua A. Bickel)
Dan Sharp of Preston, Idaho, drops a pin on a map showing where he is from, at an eclipse watching event in Paris, Texas, Monday, April 8, 2024. (AP Photo/Tony Gutierrez)
Kien McKellar of Washington D.C., prepares his cameras at an eclipse watching event in front of the cities Eiffel Tower, in Paris, Texas, Monday, April 8, 2024. (AP Photo/Tony Gutierrez)
Sasha Mahler, 8, of Munster, Ind. has her face painted with a sun during a total eclipse viewing event at the Indianapolis Motor Speedway in Indianapolis, Monday, April 8, 2024. (AP Photo/Michael Conroy)
People wait to watch a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
Eclipse glasses are for sale along with Pink Floyd's "Dark Side of the Moon," album at the Rock & Roll Hall of Fame in Cleveland, Sunday, April 7, 2024. (AP Photo/Stephanie Nano)
FILE - A total solar eclipse April 8 will enter over Mexico's Pacific coast, dash up through Texas and Oklahoma, crisscross the Midwest, Mid-Atlantic and New England, before exiting over eastern Canada into the Atlantic. (AP Photo, File)
The moon partially covers the sun during a total solar eclipse, as seen from Eagle Pass, Texas, Monday, April 8, 2024. (AP Photo/Eric Gay)
Yurem Rodriquez watches as the moon partially covers the sun during a total solar eclipse, as seen from Eagle Pass, Texas, Monday, April 8, 2024. (AP Photo/Eric Gay)
The moon covers the sun during a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
The moon partially covers the sun during a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
The moon partially covers the sun during a total solar eclipse, as seen from Eagle Pass, Texas, Monday, April 8, 2024. (AP Photo/Eric Gay)
People use special glasses to watch a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
The beginning of a solar eclipse, as seen from Fort Worth, Texas, Monday, April 8, 2024. (AP Photo/LM Otero)
Sun spots are seen during the beginning phase of a total solar eclipse, Monday, April 8, 2024, in Arlington, Texas. (AP Photo/Julio Cortez)
The moon partially covers the sun during a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
People use special glasses to watch a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
People gather under overcast skies in anticipation of watching the total solar eclipse from Niagara Falls, Ontario, Monday, April 8, 2024. (AP Photo/Matt Rourke)
A research balloon is prepared for launch at the Indianapolis Motor Speedway in Indianapolis, Monday, April 8, 2024 to study the total eclipse. NearSpace Education launched two high-altitude research balloons carrying cameras, instruments, and experiments designed by blind and visually impaired students. (AP Photo/Michael Conroy)
Kenny Riehl, of Solon, Iowa, adjusts a telescope while looking at the sun before a total solar eclipse, Monday, April 8, 2024, in Trenton, Ohio. (AP Photo/Joshua A. Bickel)
Dan Sharp of Preston, Idaho, drops a pin on a map showing where he is from, at an eclipse watching event in Paris, Texas, Monday, April 8, 2024. (AP Photo/Tony Gutierrez)
Kien McKellar of Washington D.C., prepares his cameras at an eclipse watching event in front of the cities Eiffel Tower, in Paris, Texas, Monday, April 8, 2024. (AP Photo/Tony Gutierrez)
Sasha Mahler, 8, of Munster, Ind. has her face painted with a sun during a total eclipse viewing event at the Indianapolis Motor Speedway in Indianapolis, Monday, April 8, 2024. (AP Photo/Michael Conroy)
People wait to watch a total solar eclipse in Mazatlan, Mexico, Monday, April 8, 2024. (AP Photo/Fernando Llano)
Eclipse glasses are for sale along with Pink Floyd's "Dark Side of the Moon," album at the Rock & Roll Hall of Fame in Cleveland, Sunday, April 7, 2024. (AP Photo/Stephanie Nano)
FILE - A total solar eclipse April 8 will enter over Mexico's Pacific coast, dash up through Texas and Oklahoma, crisscross the Midwest, Mid-Atlantic and New England, before exiting over eastern Canada into the Atlantic. (AP Photo, File)