condition mean min max 4 h after light 773.6 773.6 773.6 8 h after light 634.75 493.9 775.6 12 h after light 535.2 529.2 541.2 4 h after dark 830.5 638.8 1022.2 8 h after dark 863.2 822.3 904.1 12 h after dark 709.1 596.7 821.5