The next total solar eclipse to occur in the contiguous U.S. won't be until Aug. 23, 2044, and will only shadow three states in its path, Montana and North and South Dakota, according to NASA.

The next year, on Aug. 12, 2045, a total solar eclipse will span coast to coast, according to NASA. The far-reaching path of totality will cover parts of California, Nevada, Utah, Colorado, New Mexico, Oklahoma, Kansas, Texas, Arkansas, Missouri, Mississippi, Louisiana, Alabama, Florida and Georgia, the agency reports.

Adding to the decades-away excitement, since the 2044 and 2045 eclipses are slated for August, the summer season increases the likelihood of clear, cloudless skies during the event.

Internationally, on Aug. 12, 2026, a total solar eclipse is set to sweep over the Arctic Ocean, Greenland, Iceland, Atlantic Ocean, Portugal and northern Spain, according to the National Solar Observatory.

The total solar eclipse reached the final U.S. state as those in northern Maine observed the sun be covered by the moon under clear skies.

In Colebrook, New Hampshire, Monday’s total solar eclipse was captured in rare form. The sun’s corona shined behind the traveling moon during totality, creating a bright, glowing crown for eclipse viewers.

The Statue of Liberty in New York Harbor is seen in the path of the partial solar eclipse. In New York State, the path of totality spans 124 miles across 29 counties.

As millions of Americans gather to watch the solar eclipse, science teachers have been preparing their students for the historic event.

LaToya Padilla, an earth science teacher at School of the Arts in the Rochester City School District in upstate New York, said she has been talking to her students about the eclipse since October of last year. Rochester is in the path of totality.

"We talked about how it's kind of a once-in-a lifetime experience, we talked about how the last eclipse in Rochester was 99 years ago, and how it might be a whole [other] lifetime before you get to see another eclipse unless you go chasing them, which some people do," she told ABC News.

Padilla said she taught her students the difference between a partial solar eclipse, which is when the moon only partially covers the sun, and a total solar eclipse, when the moon -- for a short period -- completely blocks the sun.

She also explained the proper eye protection to wear and how when the moon covers the sun, observers will be able to see planets, including Venus and Jupiter, in the sky.

"I feel like it’s very important because you don't want [students] to wait until they're older to realize that missed out on this opportunity," Padilla said. "Even though they might not fully understand what a unique experience it is, talking to them now about it and getting them to understand that it is unique, and you may never experience this again.”