condition mean min max 4 h after light 8.8565365 8.746158 8.966915 8 h after light 9.0530515 8.948263 9.15784 12 h after light 7.693569 7.502826 7.884312 4 h after dark 9.167179 9.15536 9.178998 8 h after dark 9.578067 8.844091 10.312043 12 h after dark 8.948263 8.948263 8.948263