condition mean min max 0 h after light 11.9404 11.4615 12.4193 4 h after light 12.12495 11.7964 12.4535 8 h after light 15.1136 13.3338 16.8934 4 h after dark 20.7054 15.2219 26.1889 8 h after dark 16.0777 16.0295 16.1259 12 h after dark 12.4526 12.2525 12.6527