condition mean min max 4 h after light 498.9 498.9 498.9 8 h after light 512.95 496.9 529.0 12 h after light 525.4 464.5 586.3 4 h after dark 621.25 581.5 661.0 8 h after dark 512.9 453.3 572.5 12 h after dark 485.15 472.2 498.1