condition mean min max 0 h after light 6.543185 5.99213 7.09424 4 h after light 19.6604 19.211 20.1098 8 h after light 15.63115 14.8829 16.3794 4 h after dark 8.31003 7.73697 8.88309 8 h after dark 8.91028 8.87289 8.94767 12 h after dark 7.17336 6.52809 7.81863