condition mean min max 4 h after light 9.9702745 9.404861 10.535688 8 h after light 8.831162500000001 8.469893 9.192432 12 h after light 9.056723999999999 8.921016 9.192432 4 h after dark 9.0367785 8.971959 9.101598 8 h after dark 8.871159 8.549886 9.192432 12 h after dark 13.524245 13.524245 13.524245