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Sample Near-Rectilinear Halo Orbits (NRHOs) An NRHO would enable a cislunar space station to save propellant for orbital corrections and avoid the blocking of sunlight by the Moon from reaching the station’s solar panels, while always keeping the spacecraft within a line of sight to ground controllers on Earth. From Davis, D. et. al (2017): Orbit maintenance and navigation of human spacecraft at cislunar Near Rectilinear Halo Orbits