condition mean min max 4 h after light 715.3 715.3 715.3 8 h after light 533.55 479.8 587.3 12 h after light 542.15 462.5 621.8 4 h after dark 654.75 545.7 763.8 8 h after dark 737.05 614.0 860.1 12 h after dark 688.05 638.6 737.5