condition mean min max 4 h after light 520.3 520.3 520.3 8 h after light 750.65 649.3 852.0 12 h after light 716.6 549.7 883.5 4 h after dark 871.6 772.7 970.5 8 h after dark 1296.0 994.2 1597.8 12 h after dark 1164.65 821.6 1507.7