condition mean min max 4 h after light 9.7828175 9.404861 10.160774 8 h after light 9.3192095 9.125829 9.51259 12 h after light 9.344263 9.283665 9.404861 4 h after dark 9.389276500000001 9.373692 9.404861 8 h after dark 9.297937000000001 8.792862 9.803012 12 h after dark 9.720493 9.720493 9.720493