White Dwarf (1995)

In a distant future New York medical student Driscoll Rampart accomplishes his internship at Rusta, a rural planet that doesn't revolve around its axis and therefore is divided into contrasting halves of eternal day vs. eternal night. One is a Victorian-styled colony, the other a medieval kingdom. Both leave Rampart in a state of constant wonder, as he finds his way among humans and aliens, strange dreams and even stranger reality, a dark keep and a red sea, and more universal matters of war and peace, good and bad, love and hate and sickness and health.

Unfortunately the movie White Dwarf is not yet available on HBO Max.