App showing in Location services, but nowhere else on iPhone

It's not really an App, it's a service tied to the Astronomy Wallpapers and Lock Screen.

It uses cellular data to get astronomy data and location info for the dynamic Astronomy wallpaper. Earth, Earth Detail, Moon, Moon Detail and Solar System.

You might not need it or want it, but you are stuck with it.

That would most likely be the astronomy Lock Screen. it’s not a separate app.

Do you by any chance know if the same applies to the “Apple Watch Workout” app as pictured above in the original post and something called “CoreSuggestion.framework”? 🫣 both were nowhere to be found, except for in Location Services.

Ok it is a separate app. Please explain more what I need it on my IPhone, how is it helpful to have it?

No. It is not a separate app.