condition mean min max 4 h after light 6.186395 5.72081 6.65198 8 h after light 8.14659 7.93776 8.35542 12 h after light 11.4952 11.2459 11.7445 4 h after dark 12.7432 12.568 12.9184 8 h after dark 10.47885 10.3293 10.6284 12 h after dark 9.564375 9.34821 9.78054