How do you make the noun horizon into an adjective?

You can make "horizon" into an adjective by adding the suffix "-al" to the end, making it "horizonal".

For example:

* "The sun dipped below the horizonal line."

* "The photographer captured the horizonal expanse of the desert."

However, "horizonal" is not as common as other ways to describe something related to the horizon.

Here are some more common alternatives:

* Horizontal: This is the most common adjective used to describe something parallel to the horizon.

* Skyline: This refers to the outline of buildings or other objects against the horizon.

* Horizon-like: This describes something that resembles the horizon.

The best choice will depend on the specific context and what you are trying to convey.