condition mean min max 0 h after light 7.3776399999999995 7.22722 7.52806 4 h after light 6.752165 5.99696 7.50737 8 h after light 8.506969999999999 8.38509 8.62885 4 h after dark 11.34785 11.2435 11.4522 8 h after dark 10.409815 9.79893 11.0207 12 h after dark 9.611045 9.56829 9.6538