But what is the solstice exactly?
I did the main idea pls and two piece of evidence

Answer:
On two moments each year—what are called solstices—Earth's axis is tilted most closely toward the sun. The hemisphere tilted most toward our home star sees its longest day, while the hemisphere tilted away from the sun sees its longest night. that's as far north as you can go and still see the sun directly overhead.
Explanation:
hope it helps