condition mean min max 4 h after light 491.6 491.6 491.6 8 h after light 548.7 546.7 550.7 12 h after light 627.8499999999999 562.3 693.4 4 h after dark 595.1 553.7 636.5 8 h after dark 570.45 543.2 597.7 12 h after dark 633.0 619.7 646.3