condition mean min max 4 h after light 8.764082 8.32961 9.198554 8 h after light 9.6187675 8.919584 10.317951 12 h after light 8.9042385 8.639444 9.169033 4 h after dark 8.426334 8.037111 8.815557 8 h after dark 9.2936365 9.264804 9.322469 12 h after dark 9.918354 9.918354 9.918354