How to get natural sunlight all day long
Simple! Run a web of fiber optic cables spread evenly to locations all around the world. The speed-of-light time delay is pretty negligible, so that won't be an issue. Pipe them to your desired light fixture location. If you have placed your cables properly, you will have steady natural illumination at all hours of the day and night! Pending clouds and other weather features, of course. And the presence of oceans may be something of an impediment.