condition mean min max 4 h after light 862.6 862.6 862.6 8 h after light 940.35 897.7 983.0 12 h after light 1012.0 997.4 1026.6 4 h after dark 1129.65 1125.9 1133.4 8 h after dark 1045.85 1008.1 1083.6 12 h after dark 1186.45 1104.7 1268.2