Really bright geostationary satellites to reflect sunlight might work. At geostationary they should be far enough out that you always have line of sight to one

Really bright geostationary satellites to reflect sunlight might work. At geostationary they should be far enough out that you always have line of sight to one that isn't in earth's shadow. You'd need to specifically design them to have a huge surface area to get enough brightness. Maybe that'd make them impractical