condition mean min max 4 h after light 8.7726315 8.746294 8.798969 8 h after light 8.7461515 7.757744 9.734559 12 h after light 9.741637 9.59013 9.893144 4 h after dark 8.816511 8.41336 9.219662 8 h after dark 9.0767195 8.948263 9.205176 12 h after dark 8.948263 8.948263 8.948263