condition mean min max 4 h after light 5242.4 5242.4 5242.4 8 h after light 6714.6 6402.2 7027.0 12 h after light 7411.8 7207.1 7616.5 4 h after dark 7921.65 7856.2 7987.1 8 h after dark 8428.35 6987.8 9868.9 12 h after dark 7016.1 6313.8 7718.4