Located directly below the sun.
This word is used in science and geography to describe a very specific location.
Examples:
The subsolar point is the place on Earth directly below the sun.
The subsolar region is very hot.
The subsolar area is always sunny.
The subsolar spot is the best place to get a tan!
At the subsolar point, it's so hot that you could cook an egg on the ground.
The subsolar point is the hottest place on Earth.