An attempt to get a very specific physically realistic sci-fi/space daylight effect, with bright direct light, but no atmospheric scattering or diffuse light resulting in sharp black shadows. Like you would realistically get in a space dome. Trained on a mixture of lunar photography, chiaroscuro photography and generated imagery.

It doesn't quite get it by itself and prefers backlighting and silhouetting so for better results you can help it with:

scifichiaroscurolight, dark shadows, day but the sky is black, specular light, front light

and negative:

diffuse light, silhouette, backlight, back lit

Giving it sci-fi stuff directly gives better results as without it often cuts the sky off to look like a bad photoshop job.