condition mean min max 4 h after light 535.9 535.9 535.9 8 h after light 442.25 438.4 446.1 12 h after light 411.75 409.6 413.9 4 h after dark 352.6 304.6 400.6 8 h after dark 504.5 491.6 517.4 12 h after dark 579.9 528.4 631.4