condition mean min max 4 h after light 6.127655 5.11628 7.13903 8 h after light 8.23106 7.55636 8.90576 12 h after light 7.31063 7.06655 7.55471 4 h after dark 10.18845 9.9598 10.4171 8 h after dark 8.41525 8.08452 8.74598 12 h after dark 8.18576 7.64082 8.7307