condition mean min max 4 h after light 6.10975 5.73097 6.48853 8 h after light 9.88496 9.40552 10.3644 12 h after light 9.321365 8.10073 10.542 4 h after dark 11.6812 11.5654 11.797 8 h after dark 9.795715000000001 9.61711 9.97432 12 h after dark 7.495465 7.33614 7.65479