Here we go.

Here we go.

Here we go. Oh, my God. Oh, my goodness.

What an incredible window we have out of this spaceship Earth.

All across the country today, millions were captivated by this celestial dance.

I've never seen anything like this before.

For two and a half hours, the sun and the moon playfully waltzed across the afternoon sky.

What an event to... Oh, my gosh.

Wow. It is happening right now. This is amazing. And then if you were in just the right spot, seemingly pausing to embrace for just a few moments, a rare cosmic wonder for all to see.

There's Jupiter right there. That is Jupiter. Oh, my God. That's so cool.

For some love-struck souls, it was the perfect chance to seize a once-in-a-lifetime opportunity to dance their own forever dance under the Eclipse's shadow. I heard about this.

I thought it sounded cool, and we've been preparing for it for a long time. So I was like, How about let's go get married during the Eclipse?

Then for Courtney and Keegan Wright, from their very first date, the stars were aligned. Take me to the conversation you guys had when you said, Let's get married, but let's get married during totality.

Okay. So honest opinion, I was not a fan for it. I was like, Are you kidding me?

So what won you over?

As the months went on and talking about a bit more. I'm like, Okay, I'm getting excited about this. This is going to be different. But now that it's here, I'm actually really excited. Wedding dress and all, hair and makeup, to the T.

In the ever-shifting time. Leading them to celebrate their vows right here in Russellville, Arkansas, in an event dubbed the Total Eclipse of the Heart Festival. And let's be honest. It's nothing I can do, a total eclipse of the heart. You've been singing that song all day, too, haven't you?

And with the power vested to me by the state of Arkansas.

More than a hundred other couples saying, I do, just moments before being suspended in total darkness. Everyone behind me, all these couples just got married. They are going to spend their first moments as life partners entering totality together. It is happening right now. This is amazing. From Mexico to Maine, big cities to small towns across North America, observe the total solar eclipse in their own ways today.

I never would have believed this.

It's amazing. Thousands gathering across 15 states for a chance to experience totality. Those areas where 100% of the sun was eclipsed by the moon. At most, Eclipse viewers got about four and a half minutes blanketed in the moon's shadow.

Whenever there's a light and an object, a shadow is cast. The closer the moon, the longer the duration of totality.

All along the path of totality, by ABC friends and colleagues felt what I felt, moments of awe and wonder.

And there it is.

Starting on the western Coast of Mexico in the city of Mazatlán.

But I think this was even more remarkable than what I was expecting.

Where Americans, like Amy, traveled all the way from New Jersey to experience the first moments of the Eclipse hitting land. This is amazing. Amazingly beautiful. Once in a lifetime. Beautiful. The massive attention bringing much-needed business to many parts of the country. In Del Rio, Texas, local winery even created a special blend just for the occasion.

We actually created this wine.

It's called the Eclipse.

We're going to be enjoying this for the next 20 something years.

Remember the last time we were all told to look up? It was 2017, and that was the first total eclipse to hit the continental US since 1979. So what makes an eclipse so special? Time for a science lesson. The Earth rotates on its axis, making a full turn every 24 hours. The moon circles the Earth every 31 days, and the Earth and the moon rotate around the sun every 365 days.

So the Sun and the moon, even though they are very different in their sizes, because the sun is 400 times farther away than the moon, that makes the sun 400 times smaller. So in our night sky, they look like they're at about the same size.

The moon has to move directly between the Earth and the sun in perfect alignment for an eclipse, and it has to be during a new moon. The sky will darken as if it were dawn or dusk, and you'll only be able to see the sun's outer atmosphere, the Corona.

The Corona is the sun's outermost atmosphere. So when you look at the solar eclipse, you see streamers.

If you were lucky enough to be in the path of totality, you were able to look directly at the sun. Exactly what your parents told you not to do as a kid.

The rule for looking at the sun is never do it without proper eye protection when any part of the sun's surface is exposed.

Your fellow sun gazers weren't the only ones affected. Plants and animals are known to react, too. And I'm not just talking about phyto and fluffy.

Animals and plants take their cues from the sun quite often. So what happens when the temperature starts to drop and then it gets dark? Well, those animals that don't want to be awake at night, they go to bed. Birds will roost, and those that are nocturnal, they'll come out.

This is the small city of Carbendale, Illinois, population about 21,000. But for the folks who are lucky enough to be from Carbendale, they've gotten to see a total eclipse twice in 2017 and again today. Look, there's the wedding ring. No way. Yes, look at the Corona. You can see the Corona, the sun. They've been preparing for weeks for the influx of umbral files. That's the proper name for Eclipse chasers that came their way today.

We are approaching totality right now.

Moments of total darkness also coming to Indianapolis.

Incredible to think about the moon, the sun, and the Earth all in a perfect line.

Where my friend and colleague, Giovanides, couldn't help but get swept up in the gravity of the moment.

Here, everyone is together. Nobody is divided. Everyone is unified and looking up at the sky together and seeing that we really are this small on this planet.

And by the time it reached New York City, even though it wasn't in total darkness, people were still going out of their way to catch a glimpse. Back in Arkansas, where Courtney and Keegan are writing the next chapter of their love story, Keegan and Courtney are among the 108 couples pledging their love to their one and only.

Well, we got four suitcases, and we got one that's empty just in case we don't know what we're coming back with.

You may now seal the sacred union with a kiss. Moments after saying, I do. Congratulations, you all. The newlyweds all turned their eyes to the sky and shared their first dance.

It's much more than what I imagine. This is just breathtaking. It's like nothing I've ever seen before.

Now, if you're watching all of this and getting just a bit jealous because you didn't get your chance to sit in the cosmic shadows, well, your next shot at seeing a total solar eclipse in the continental US, won't be until 2045.

Just wow. Moments Millian shared and celebrated together. It was Maya Angela who said, Life is not measured by the number of breaths we take, but by the moments that take our breath away. Today was one of those moments. Hi, everyone. George Stefanopoulos here. Thanks for checking out the ABC News YouTube channel. If you'd like to get more videos, show highlights, and watch live event coverage, click on the right over here to subscribe to our channel. And don't forget to download the ABC News app for breaking news alerts. Thanks for watching.