Evening sky, or how do I use the Sky Texture Node? I'm trying to create a sky and light setup to approximate this image:

 

Something like what photographers call the blue hour. Apart from the orange spot lights there is the gradient created by the indirect light from the sun that is sitting below the horizon. I have made this super quick setup to begin approximating it:



Why does the ColorRamp not work as it should? With four colour stops I should see a gradient no? With the orange on the horizon. You can see the sunlamp is pointing directly up, so the light on the sphere is coming from below.

Maybe there is something I'm not understanding about how to employ the Sky Texture. Can it be tied to the sunlamp in some way?

The light from the sky should affect objects in the scene as well as the spot lamps. So how would you recreate the sky and lights for a scene like the image? Sincere thanks for your suggestions.
I don't know anything about Sky Texture but it looks like this setup works the way you want:

Plug the Sky Texture (Preetham mode) into a Gradient into your ColorRamp (always better to use a Gradient before a ColorRamp if you want your gradient to look like your ColorRamp spectrum, I dont know why though).

You can also use Texture Coordinate > Mapping nodes before your Sky Texture if you want more control on the sky position/orientation.