Can you substitute orange juice for apple cider?

Yes. It has a much more "full" flavor than Apple juice because it has not been filtered and there are still bits of pulp in suspension. Apple juice has been filtered and pasteurized and has a very "thin" texture. It's also a bit more crisp. But I can't see any reason you can't substitute one for the other in most recipes, unless you're making spiced cider, but even then, if you don't mind the thinner, brighter texture, Apple juice would work in a pinch.