Cortland had earlier mentioned the place as planet. At 21:50, Tarren Hollis clarifies to him that it is a moon and the planet is the big body in the sky. At that point, the planet and her other moon appearing as a small white arch far away above horizon, both are lit from this line of view. The angle of the day and night on the planet and the other moon is such that, that no direct sunlight should have been on the place where Cortland and Hollis are on this moon, so it should have been dark of night here, having just the lights reflected from the planet and other moon. Still, the place is shown as having enough light to indicate it is morning or evening on this moon.